it would be hours before tom's father returned home, but the house was not empty. 57-year-old shirleeherman, who scrubbed and polished the hunter home on thursdays, was still there. by sunset, both tom hunter and shirlee sherman would be dead, murdered by a killer who was just getting started. who did it, and why were questions that would eventually take omaha detectives all over north america and would take more than five years to answer. >> this one stood out, obviously, because of the brutality for one. >> reporter: detective derek mois, was working 3:00 to 11:00 that day. the 911 call came in from tom hunter's dad, dr. william hunter. >> dr. hunter had come home, found shirlee sherman and his son deceased and would call 911. >> anything unusual about that call? >> there wasn't a lot of emotion shown, but he is a doctor. he is a pathologist. >> and he's seen a lot of dead people. >> and he's seen a lot of death, and it was i think to use a word clinical. >> reporter: the detective and his partner were immediately dispatched to the hunter's stately home in dundee. >> nice part of to

what about all the other victims here that can't speak to shirlee or thomas or roger or mary. >>> i'm craig melvin. >> and i'm natalie morales. >> and this is dateline. >> this was an insane world i was living in. i did what i had to do. >> what if you were ripped away from your family? >> you live in fear. it changes you. >> kidnapped by a killer. >> i came out of that just really messed up. >> held for years as a prisoner. and what if prosecutors never believed you? >> bobbi parker was not the woman she was portraying herself to be -- >> absolutely not. >> it's a mystery with a mind-boggling twist. this wife and mom taken hostage. was she really a hostage at all? >> their relationship was not one of kidnapper and victim. it was one of husband and wife. >> his prisoner or his lover? >> i really do love you. sounds like a pretty heartfelt love letter. >> in this hour she shares her side of the story. will you believe her? >> i was fighting for my life. >> hello and welcome to dateline. i'm craig melvin. bobbi was rescued. she said she'd been taken hostage. was she a captive or was she