>> reporter: and you must have had a reason for knowing that. >> that's what i assume. >> reporter: it turned out lisa did know something, just not what tara expected. there were secrets which lisa and gavin kept hidden. >> he adored me, our family was exactly what he wanted to have. it just got lost. >> reporter: lost. it all started in the early ''80s even before she met gavin when he was a stunt man 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 take 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.