. >> lindsay patterson was on leave from her i.t. n the navy, visiting her mom who lives just over the backyard wall from the hall house. lindsay was inside, in the bathroom that faced away from the hall house and out onto the street, when she heard a noise. >> it was a horrible scream. it was just, something was wrong kind of scream. >> a woman's, she thought. she went outside to tell her mom. i said, did you hear that scream? she said, yeah, but i think it's just kids playing in the -- playing in the pool. >> kids, at six something in the morning? lindsay walked over to the six-foot brick wall between their yard and the halls'. she stepped on the planter, she said, and looked over the wall. >> at that point i saw a man with his hand, one hand on top of a woman's head and one hand on her back, and she was face down in the water. >> like something was going on? >> yeah, that's what i assumed. >> that is, she thought she was looking at a sex act in progress. >> i don't know why it didn't seem right. but something made me want to look a