. >> reporter: maria dosso called her husband's parents, phil and nicoletta. they hadn't heard from their son or daughter either. so the elderly dossos got in their car about 6:30 p.m. and drove 20 miles to the shop, erie manufacturing. the lights were on. they saw their daughter, diane's, car parked out front. >> i walked in, the door was open. it was not locked. i walked in there and i saw diane. i said, my god, diane, who did this to you? who did this to you? >> reporter: the parents saw their daughter diane first in the hallway, her legs crumpled beneath her in a pool of blood. she'd been shot twice in the head. around the corner, more. diane's husband, murdered execution-style. his body was slumped by dosso's long-time business partner, george gonsalves. and a few feet away lay their son frank, maria's husband, the twins' father, like the others, shot in the head. >> my daughter, my son, my son-in-law and my partner, they're all dead! >> and then the police came and everything. i don't know anymore. i said to the police, let me stay until you take them ou