How a Colorado man pushing his wife off a cliff exposed decades of lies

ToniHenthorn’s2012triptoColorado’sRockyMountainNationalParkwasmeanttocelebrateherandherhusband’s12thweddinganniversary.Itendedwithherlyingdeadatthebottomofaremotecliff,andthesubsequentinvestigationexposeddecadesofdeceptionbyherhusbandHarold. Thecouplemetonline,livedjustoutsideDenver,andToni’scareerasanophthalmologistandHarold’sworkasafundraisermadeitseemthattheyhadahappy,stablehomelifepriortohersuddendeath. Anew“20/20”episode,“MountainofLies,”airingFriday,Feb.28,at9p.m.ETonABCandstreamingthenextdayonHulu,examinesthecase. TheirdaughterHaleywasonly7atthetime,butremembershermotherfondly. “Shewasamazing,”HaleyBertolet,whouseshermother’smaidenname,exclusivelytoldEvaPilgrim,co-anchor,GMA3andABCNews,inherfirstinterviewsincethatdarkday.“Shewassointelligent,andsowiseandeloquent.” HaroldtoldauthoritiesthatToniaccidentallyslippedandfelltoherdeathoffa