>>> TONIGHT ON "DATELINE" -->>> TONIGHT ON "DATELINE" -->> ME AND MY SISTER WERE REALLYSCAREDWE FELT A LITTLE BROKEN.WHY WOULDN'T SHE COME BACK TOUSSHE LOVED US>> IT GRIPPED THE COMMUNITY.WHERE IS SHEWHAT HAPPENED TO HERWHO'S RESPONSIBLE?>> WE WENT INTO FULLINVESTIGATION IMMEDIATELY.>> QUITE HONESTLY, IS ITPOSSIBLE SHE IS ALIVE?>> HE WAS WATCHING HER ANDFOLLOWING HER.>> DEEPLY CREEPY STUFF, CRIMINALACTS THAT HE'D RECORDED.>> YESTHAT'S HIS FAVORITE THING,COLLECTING WOMEN>> MY HEART JUST SUNK.HOW MANY OTHER TIMES HAS HE DONETHISHOW MANY OTHER WOMEN HAS HE DONETHIS TO?>> A YOUNG NURSE VANISHES IN AMYSTERY STAINED WITH EVIL.>> HE BROUGHT US TO THE BACK>> AND WE ALL LOOKED DOWN.♪>> WE JUST GASPED.>> WE JUST GASPED.>> I'M LESTER HOLT AND THIS IS"DATELINE."DATELINE.HERE'S DENNIS MURPHY WITH "THEDEVIL WAS WATCHING.">> Reporter: THE FRONT RANGE OFCOLORADO, THE VAST GRASSLANDSEAST OF THE ROCKY MOUNTAINS,OFFERS PLENTY OF PLACES TOCONCEAL THE BODY OF A 97-POUNDWOMAN.THIS WOMAN -- TINA SANDOVAL.SO THE QUESTION THAT GETS SAIDFOR THE NEXT TWO DECADES, "WHEREARE YOU, TINA?>> AND THEN THE SEARCH BEGAN,YEAH>> Reporter: WHERE ARE YOU>> YEPAND WE SEARCHED -- OH, GOSH,PROBABLY OVER 50 DIFFERENTLOCATIONS.>> Reporter: OFFICIALLY SHE WASA MISSING PERSON, HAD BEEN FORMORE THAN 20 YEARSBUT THE AUTHORITIES, LIKEVETERAN DETECTIVEBRAD GOLDSCHMIDT, COULDN'TACCEPT THAT SHE WAS A RUNAWAYLOOKING FOR A FRESH START.HE HAD SPENT MORE HOURS THAN HECOULD COUNT SEARCHING GRAVELPITS AND DRAINED PONDS FORMISSING TINASO POOR TINA WAS JUST A SMALL,LITTLE WOMANAND THERE'S A LOT OF COLORADO?>> JUST THIS ONE AREA HERE,REALLY, TO PROBABLY -->> Reporter: DID YOU THINK,"WE'RE NEVER GONNA GET THIS">> OH, I THOUGHT WE'D NEVER GETHER.>> Reporter: THEY COULDN'T PROVEIT, BUT IT WAS THE CONSENSUS OFLAW ENFORCEMENT THAT THE YOUNGNURSE WAS THE VICTIM OF FOULPLAYHER SISTER SUSAN DIDN'TDISAGREE>> IT JUST WASN'T FAIRYOU KNOW, SHE WOULD'VE BEEN SOGOOD FOR THE WORLD>> Reporter: AND SHE HAD ANUNSHAKEABLE THEORY ABOUT WHOMADE HER SISTER DISAPPEAR.>> EVIL.HE'S JUST EVIL>> Reporter: DID YOU THINK, "INOW HAVE HANNIBAL LECTER HERE">> YESTHIS GUY IS BY FAR THE WORSTCRIMINAL I'VE EVER INVESTIGATED.>> Reporter: THE PROBLEM WITHTHE MISSING TINA INVESTIGATIONWAS THIS -- HOW COULD APROSECUTOR CONVINCE A JURY SHEWAS MURDERED IF YOU COULDN'TEVEN PROVE, BEYOND A REASONABLEDOUBT, THAT SHE WAS, IN FACT,DEADTICK IT OFF.WHAT -- WHAT WERE THE USUALINGREDIENTS YOU WERE MISSINGHERE>> WE DID NOT HAVE A VICTIM'SBODYWE DID NOT HAVE A -- ANY KIND OFA CONFESSION OR ADMISSION BY ASUSPECT.WE DIDN'T HAVE A CRIME SCENEWE DIDN'T HAVE ANY PHYSICALEVIDENCE>> Reporter: CAROL, A NURSE ANDCO-WORKER OF TINA'S, SPENTWEEKENDS LOOKING FOR HERVANISHED FRIEND ONLY TO BESTARTLED AWAKE LATER WITH ASTEPHEN KING-LIKE VISION>> I WOULD BE, LIKE, ON A REMOTEAREA, AND SHE WAS IN A SHALLOWGRAVE IN MY DREAM, AND SHE WOULDSIT UP, KINDA ZOMBIE STYLE, ANDSHE WAS TRYING TO TELL ME WHERESHE WAS BURIEDAND I ALWAYS WONDERED, "IS THATREALLY HER TELLING ME?" YOUKNOW, "OR IS IT JUST MY WAY I'MCOPING WITH THIS?">> Reporter: EVENTUALLY THEREWOULD BE A GRAVEBUT IT WASN'T SHALLOW, AND ITWASN'T OUT IN THE PRAIRIE.WASN'T OUT IN THE PRAIRIE.BUT THERE'S SO MUCH TO KNOWBEFORE I TELL YOU ABOUT THATGO BACK TO A TIME IN AMERICAWHEN KIDS WOULD PLAY OUTSIDE ONSUMMER NIGHTS TILL THESTREETLIGHTS CAME ONIN WINDSOR, COLORADO, YOU MIGHTHAVE MET THE TOURNAIS.THERE ARE A LOT OF THEM.HERE'S ANNIE>> NINE KIDSSEVEN GIRLS, TWO BOYS.>> Reporter: AND WHERE WERE YOUIN ALL THAT?>> I'M THE YOUNGEST, NUMBERNINEIT WAS KINDA LIKE BOOT CAMP.YOU KNOW, AS SOON AS YOU GET TOA CERTAIN AGE, "HERE'S HOW YOUDO LAUNDRYHERE'S HOW YOU CLEAN.">> Reporter: DAD MICHAEL WAS ANEX-MARINE AND A FORMER CITY COP.MOM MARY ELLEN WORKED AT THECAMPUS BOOKSTORE IN NEARBYGREELEY.ANNIE'S SISTER, OLDER BY13 YEARS, WAS TINAWAS SHE SOMETHING LIKE AN OLDERAUNT TO YOU OR SOMETHING, OR -AS MUCH AS A SISTER -->> NO, SHE -- SHE WAS VERY MUCHA SISTER TO MESHE CARED FOR MESHE PLAYED WITH MESHE WOULD PLAY WITH US IN OURCLUBHOUSE.BEING WITH FAMILY MADE HER VERYHAPPY.SHE LOVED US KIDS A LOT.>> Reporter: TINA WAS A LITTLESHY BUT A SPIRITED COMPETITOR INHIGH SCHOOL BASKETBALL ANDTRACK.FINDING SUITABLE BOYFRIENDS WASWHERE SHE STUMBLED SOME, ASSISTER SUSAN RECALLSMOM AND DAD DID NOT APPROVE OFTWO OF HER YOUNG STEADIES.>> YEAH, SHE KINDA FOUND THEONES THAT NEEDED HELP AND SHETHOUGHT SHE COULD HELP THEM.>> Reporter: BUT COLLEGE GAVEHER FOOTING, AND STUDIES INNURSING GAVE HER DIRECTIONTHAT'S WHERE SHE MET A GUYTAKING CLASSES TO BECOME ARADIOLOGY TECHNICIANHIS NAME WAS JOHN SANDOVALSO WHAT DID YOUR PARENTS THINKOF THIS JOHN>> I THINK MY PARENTS KINDALIKED HIM.HE WAS A LITTLE OLDER THAN TINA.>> Reporter: AND JUST LIKE THAT,TINA WAS SOON SHARING ANAPARTMENT IN GREELEY, COLORADO,WITH HER NEW BOYFRIEND, JOHNKID SISTER ANNIE, ABOUT NINE ATTHE TIME, THOUGHT IT WAS ALLVERY EXCITING.>> I REALLY LOOKED UP TO THEIRRELATIONSHIP A LOTI THOUGHT THEY WERE A GOOD FITI THOUGHT IT WAS A FAIRYTALE,YOU KNOW>> Reporter: ANNIE LOVED GOINGOVER TO TINA AND JOHN'S TO PLAYCHINESE CHECKERS AND MESS ABOUTWITH THEIR NEW DOG, CODYTINA HAD BROKEN OUT OF HERSTRICT "MASS ON SUNDAY" CATHOLICUPBRINGINGWHAT DOES YOUR CHILDHOOD MINDMAKE OF YOUR SISTER AND HIS --HER BOYFRIEND?>> I DON'T THINK ANY OF MY OTHERSIBLINGS HAD LIVED WITH SOMEBODYBEFORE, SO IT WAS A WHOLE NEWEXPERIENCE>> Reporter: AND THERE WAS GONNABE A WEDDING>> AND THERE WAS GONNA BE AWEDDING, AND WE WERE IN THEWEDDING!>> Reporter: JOHN AND TINA HADFOUND A CHAPEL UP IN THE ROCKIESTO EXCHANGE THEIR VOWS>> VERY, VERY BEAUTIFUL.WE TOOK A HUGE GROUP PICTURE OUTFRONT OF THE CHAPEL AFTERWARDS>> Reporter: JOHN TOASTED HISBRIDE AT THE RECEPTION>> I'VE GOT THE BEST WOMAN A MANCOULD EVER ASK FOR, AND OURFAMILY IS JUST GETTING BIGGER.WELCOME TO THE FAMILY![ CHEERS ]>> Reporter: TINA OPENEDPRESENTS>> THIS IS FROM ANNIE!OHH.>> I MADE IT>> IT'S A BOOK>> Reporter: A LITTLE FLOWERGIRL REMEMBERS TEARING AROUNDTHE RECEPTION HALL SQUEALINGWITH ALL HER SISTERS>> IT'S A TIME TO BE GLEEFUL ANDHAPPY AND ENJOY THE TIME>> Reporter: JOHN'S COUSIN ANDBEST MAN, JESSE, GAVE A LITTLESPEECH>> I KNOW THEY'RE GOING TO DOWELL FOR EACH OTHER.THANKS AGAIN FOR EVERYBODY FORMAKING IT.>> Reporter: JESSE FOR SOMEREASON SET ANNIE'S TEETH ONEDGE>> HE WAS EXTREMELY QUIET.KINDA MADE ME NERVOUS.I JUST HAD A FEELING ABOUT HIMTHAT I JUST COULDN'T PUT MYFINGER ON.>> Reporter: AND SO AFTER THETOASTS AND HAPPY TEARS, THE NEWMISTER AND MISSUS WERE OFF TOCANCUN FOR A MEXICAN BEACHHONEYMOON.THE SNAPSHOTS SHOW A HAPPYCOUPLEANNIE WAS THRILLED TO GET ASOUVENIR>> CANCUN T-SHIRTS, AND THAT WASPRETTY COOL 'CAUSE WE HAD NEVERBEEN OUT OF THE COUNTRY OR EVENFLOWN ON A PLANEAND HERE'S TINA GOING ON A COOLVACATION, YOU KNOW>> Reporter: SO A SUNTANNED TINARETURNED TO HER NURSING STUDIES.HAPPY FOREVER AFTER?NOT EXACTLY.>> I DIDN'T SEE IT COMING.DIDN'T NOTICE ANYTHING OFFKILTERAND THEN, SUDDENLY, WE WEREMOVING TINA INTO A NEWAPARTMENT.>> WHAT HAD HAPPENED SOSUDDENLYSUDDENLYHAD TINA BEEN KEEPING A SECRETWHEN WE COME BACK -->> THE MYSTERY THAT WOULD TAKE20 YEARS TO SOLVE WAS JUSTGETTING STARTED.>> THERE WAS NO BODYTHERE WAS NO CRIME SCENETHERE WAS NO WITNESSESQUITE HONESTLY, IS IT POSSIBLESHE IS ALIVE AND LIVINGSOMEWHERE ELSEGet out in front of itwith CIBINQO.SOMEWHERE ELSEay off.For those whodidn't respond topast treatments...Once-daily CIBINQOproactivelytreats eczemawhether you're flaring or not.CIBINQO can lower yourability to fight infections,including TB.Before and during treatment,your doctor should checkfor infectionsand do blood tests.Tell your doctor if you'vehad hepatitis B or C,have flu-like symptoms,or are prone to infections.Do not take with medicinesthat prevent blood clots.Serious, sometimes fatalinfections,lymphoma, lung,skin and other cancers,serious heart-related events,and blood clots can happen.People 50 and older withheart disease risk factorshave an increased risk ofserious heart-relatedevents or deathwith JAK inhibitors.Get out in front of eczema.Ask your 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Check.And check.RINVOQ can lower your abilityto fight infections,including TB.Serious infectionsand blood clots, some fatal;cancers, including lymphomaand skin cancer;death, heart attack, stroke,and tears in the stomachor intestines occurred.People 50 and older withat least 1 heart diseaserisk factorhave higher risks.Don't take if allergicto RINVOQas serious reactionscan occur.Tell your doctor if you areor may become pregnant.Put UC in check and keepit there, with RINVOQ.Ask your gastro about RINVOQ.And learn how AbbViecould help you save.>>> SHE WAS REALLY IN LOVE IN>>> SHE WAS REALLY IN LOVE INTHE BEGINNING.>> Reporter: WHAT DO YOU THINKTHE GLUE WAS THERE>> I THINK THE WAY HE TALKED TOHER JUST SO GENTLY, AND HE JUSTTREASURED HER.HE MADE HER FEEL REALLY SPECIAL,AND SHE HADN'T FELT THAT WAY FORAWHILELIKE, SHE'D BEEN TREATED LIKEDIRT>> Reporter: THAT CAN GO A LONGWAY, RIGHT>> HE CALLED HER "KITTEN" ANDJUST WAS, LIKE, CONSTANTLY,"YOU'RE SO BEAUTIFULYOU'RE SO BEAUTIFUL, I CAN'TBELIEVE I'M WITH YOU.">> Reporter: HE MIGHT HAVE BEENAN ELOQUENT SWEET TALKER, BUTJOHN SEEMED TO HAVE TROUBLEHOLDING A JOB.HE NEVER DID FINISH HISRADIOLOGY CLASS AND FOUND ASTRING OF PART-TIME, HOURLYJOBS -- WORKING IN A LIQUORSTORE, A CUSTOMER-CARE CALLCENTERABOUT TWO YEARS INTO THEMARRIAGE, TINA'S SISTER, SUSAN,COULD SENSE THAT SOMETHING WASOFF.>> SHE WAS FEELING LIKE MAYBEJOHN ISN'T WHO SHE THOUGHT HEWAS.>> Reporter: DID YOU SCRATCHAROUND ON THAT>> A LITTLE BIT.SHE WASN'T VERY FORTHCOMING INTHE BEGINNING.I KNEW THEY WERE HAVINGASKED HIM, I SAID, "WELL, WHY ISTINA MOVING OUT?WHAT'S GOING ON?AND HE SAID, "OH, DON'T WORRY.WE JUST NEED A LITTLE BIT OFSPACE.DON'T WORRY.WE'LL BE BACK TOGETHER SOON.>> Reporter: BUT JOHN SANDOVALSOON PLUMMETED FROM ANNIE'S LISTOF ADMIRED MEN BECAUSE OFSOMETHING THAT HAPPENED JUSTAFTER THEY'D FINISHED GETTINGTINA MOVED>> HE TOOK ME AND MY SISTER BACKTO TOWN.AND HE GOT US SOME ICE CREAMCONES AND TOOK US TO THE LAKE.AND THEN HE STARTED DRIVING DOWNTHE BOAT DOCK INTO THE LAKE.>> Reporter: THE BOAT LAUNCHTHE RAMP>> YES>> Reporter: IN THE VEHICLE?>> YESAND ME AND MY SISTER WERE REALLYSCAREDWE DIDN'T KNOW WHAT HE WASDOING.>> Reporter: DOING IT AS A GOOFOR --?>> IT WAS A DIFFERENT SIDE OFHIM I'D NEVER SEENI -- HE SEEMED TO BE -- BEGETTING JOY OUT OF OUR TERROR.>> Reporter: AND THE WATER'SCOMIN' UP OVER THE HUBCAPS>> YEAH.AND WE JUST DIDN'T KNOW WHAT WASGONNA HAPPENAND THEN HE STOPPED AND BACKEDUP AND TOOK US HOME.AND THAT WAS IT.>> Reporter: DID HE BECOME ACATEGORY OF A DIFFERENT PERSONAFTER THAT TO YOU?>> YEAH.YEAHIT WAS ->> Reporter: THE JOHN YOUIDOLIZED WASN'T NECESSARILY THESAME GUY>> YEAH.HE -- HE SCARED US>> Reporter: SCARY ANDJOHN SANDOVAL WERE JUST GETTINGUP TO SPEED.>>> COMING UP -->>> COMING UP -->> MY JAW DROPS, AND I'M LIKE,"WHAT?>> A SEPARATION AND ANOBSESSION.>> SHE WOULD LOOK OUT OVER HERBALCONY.SHE SAID HIS CAR WOULD BE THEREFOR HOURS.>> HE WAS LETTING HER KNOW THATHE WAS WATCHING HER ANDFOLLOWING HER.>> WHEN "DATELINE" CONTINUESTry. Hope. 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ISAID, YOU KNOW, "TELL ME MOREABOUT JOHN."AND SHE SAID, "WELL, JOHN HAS ADISEASE.AND I -->> Reporter: DISEASE>> I SAID THAT, TOO."WELL, WHAT DO YOU MEAN?AND SHE SAID, "WELL, HE HASVOYEURISM.AND I DIDN'T KNOW WHAT THATMEANT AT THE TIME.I SAID, "WELL, WHAT'S THAT?"AND SHE SAID, "WELL, YOU KNOW,HE'LL SEE A PRETTY GIRL AT THEGROCERY STORE AND HE'LL KINDAFEEL COMPELLED TO JUST FOLLOWHER HOMEAND HE MIGHT WATCH HER FOR TWOOR THREE DAYS.AND, YOU KNOW, SHE ->> Reporter: I MEAN, WHAT DID -->> -- SAID IT JUST SUPER CALMLIKE THAT.>> Reporter: AS THOUGH THIS IS ANORMAL KIND OF ->> RIGHTAND -->> Reporter: -- STORY TO TELL?>> YOU KNOW, MY JAW DROPS ANDI'M LIKE, "WHAT?THAT'S -- THAT'S LIKE ASTALKER.SHE SAID, "NO, NO, NO.YOU DON'T UNDERSTANDIT'S AN ILLNESS.HE CAN'T HELP IT.">> Reporter: A DISEASE OFSTALKING>> IN NURSING SCHOOL, WE LEARNABOUT ALL THE PERSONALITYDISORDERS.I DON'T EVER REMEMBER LEARNINGTHAT IT WAS ANY KIND OF ANILLNESS.>> Reporter: SO, "MY HUSBAND ISA GUY WHO FOLLOWS WOMEN AROUND.">> RIGHT>> Reporter: CAROL LET THESTUNNING REMARK SLIDE AS SHE ANDTINA WENT TO A CLUB THAT NIGHTAND THEIR FRIENDSHIP WAS BORN.THE TOPIC OF HER ABOUT-TO-BEEX'S SO-CALLED DISEASE CAME UPAGAIN.>> AND I SAID, "SO DO YOU THINKTHAT JOHN EVER WATCHES YOU?"AND SHE SAID, "YEAH.SAME THINGREAL CALM ABOUT ITAND I SAID -- YOU KNOW, SHESAID -- SHE WOULD LOOK OUT OVERHER BALCONY.SHE SAID HIS CAR WOULD BE THEREFOR HOURS, JUST WATCHING>> Reporter: HIS CAR>> HIS CAR>> Reporter: THEY'RE SEPARATED>> UH-HUH.>> Reporter: BUT HE'S CHECKINGHER OUT?HE'S STALKING HER.>> RIGHT>> Reporter: DID THAT CREEP HEROUT?>> YOU KNOW, SHE SAID ITMATTER-OF-FACTLYSHE DIDN'T SEEM AFRAID AT THETIME>> Reporter: ONCE SHE'D MADE THEDECISION TO LEAVE, TINA TOLD THESAME STORIES TO HER SISTER,SUSAN.TINA FINALLY CONFIDED SHE HADMARRIED A PEEPING TOM.HE'D LEAVE THEIR BED IN THEMIDDLE OF THE NIGHT, SHE SAID,TO CRAWL BACKYARDS AND SOMETIMESBRING BACK TROPHIES -- WOMEN'SUNDERWEAR.BUT TINA ALSO CONFIDED SOMETHINGELSESHE WAS MOVING ON FROM JOHN,DRAWING CLOSER TO OLD FRIENDS,INCLUDING JOHN'S COUSIN, JESSE,THE SILENT BEST MAN AT THEIRWEDDING.JESSIE IN PARTICULAR, THECOUSIN, DID HE BECOME MORE OF ADATEWAS HE AN INTIMATE FRIEND OFHERS, DO YOU THINK>> YOU KNOW, I NEVER KNEW FORSUREI KNEW THEY WERE TALKING, THATHE WOULD COME OVER TO HERAPARTMENT SOMETIMES.>> Reporter: 'CAUSE YOU WONDERIF IT KINDLED JEALOUSY>> RIGHTRIGHT.BUT SHE WAS ALSO TALKING TOOTHER PEOPLELIKE, MY OLDER SISTER'S FRIEND,KEVIN, WAS ANOTHER PERSON THATSHE WAS TALKING TO WHO WOULDALSO COME AND CHECK ON HERAND THEY WOULD SOMETIMES GO OUTAND DO THINGS TOGETHERSO DEFINITELY NOT SETTLING IN ONANYBODY IN PARTICULAR.AND HE WAS LETTING HER KNOW THATHE WAS WATCHING HER ANDFOLLOWING HER.HE EVEN HAD JUMPED ONTO THE DECKOF HER APARTMENT FROM THESTAIRCASE THAT LED UP TO HERFRONT DOOR AND WAS WATCHING HERIN THERE AND TOLD HER EVERYTHINGHE SAW>> Reporter: SO WHERE WAS JOHNIt's clinically provento moisturize dry skinfor 24 hours.Aveeno®A is for Awareness,because knowing that yourchronic kidney diseasein type 2 diabetescould progress todialysis is important.B is for Belief that theremay be more you can do.Just remember thatK is for Kidneysand KERENDIA.For adults living with CKDin type 2 diabetes,KERENDIA is proven to reducethe risk of kidney failure,which can leadto dialysis.KERENDIA is aonce-daily tabletthat treats CKD differentlythan type 2diabetes medicationsto help slow the progressionof kidney damageand reduce the riskof cardiovascular events,such as heart attacks.Do not take KERENDIAif you have problemswith your adrenal glandsor take certain medicationscalled CYP3A4 inhibitors.KERENDIA cancause hyperkalemia,which is high potassiumlevels in your blood.Ask your doctor before takingproducts containing potassium.KERENDIA can also causelow blood pressureand low sodium levels.So now that you knowyour ABCs,remember, K is for Kidneys,and if you need helpslowing kidney damage,ask your doctorabout KERENDIA.1995 TINA CLOCKED INTO THE1995 TINA CLOCKED INTO THEOVERNIGHT NURSING SHIFT AT THEONCOLOGY UNIT -- 7:00 P.M.TO 7:00 A.M.THAT LAST NIGHT, WHAT DO YOUREMEMBER ABOUT IT?>> I THINK THAT WAS ONE OF THOSECRAZY BUSY NIGHTS, FOR ME ATLEAST, THAT WE TALKED ABOUTBECAUSE I WASN'T PART OF THECONVERSATION THAT I KNOW SHE HADWITH SOME OF THE OTHER NURSES.>> Reporter: THE CONVERSATION --TINA WAS DISTRACTED THAT NIGHTBECAUSE, AS SHE TOLD HER FELLOWNURSES, WHEN SHE GOT OFF SHIFTIN THE MORNING, SHE WAS GOING TOHAVE A BIG CONVERSATION WITHJOHN AT HIS HOUSE ABOUT BRINGINGTHE DIVORCE TO A CLOSEFINAL MONEY ISSUES, FINAL LEGALPAPERWORK.SHE WAS APPREHENSIVE THAT NIGHT?>> SHE WAS