>> they're no longer living. >> and you must have a reason for knowing that >> that's what i would assume. >> reporter: it turned out lisa did know something just not what tara suspected there were secrets, which lisa and gavin kept hidden. >> i was the love of gavin's life he adored me our family was exactly what he wanted to have he just got lost >> reporter: lost. it all started in the early 80's, even before she met gavin, when he was a stuntman on the tv series "remington steele." he played a shooting victim, falling from a second story window the stunt went wrong and he broke his back >> he would get pain pills for his back so usually percocet, something like that for pain when that didn't work anymore, he was prescribed oxycontin. and he was addicted to it. >> reporter: he went to a drug rehab center called the matrix institute here in the san fernando valley.