>> reporter: uncle nelson managed to get david away from the garage. >> dave was trying his best to get back in. i wouldn't let him go back in. >> so you really are the officer, securing the scene? >> i was trying to, i knew it had to be done, 'cause i knew we had a crime scene and i wanted to make sure that i didn't do anything to hamper it. >> reporter: david camm says he was way beyond understanding anything that night, but the questions wouldn't stop. >> all these things spinning around inside my head. is this real? am i really here? did i really just find kim, brad, and jill, as they are? you know it was just uh, it was surreal. >> reporter: that night was the end of everything david and kim had built together. they'd met in the late 1980's. they were introduced by marcy mcleod. marcy had been best friends with kim ever since ninth grade. >> she was very quiet, for the people that didn't know her, and