said he ended up spending the night with friends about an hour to the north. >> is he saying anything, he can't do it? i know boyfriends are figured suspicions, i want to talk to a lawyer? >> no, he's being more than cooperative. >> while tim says he was off with his friend, there appeared to have been a frenzied struggle at karen's house. forensic specialist ana cox assessed the bloody aftermath. >> she put up a heck of a struggle. >> what are you looking at? >> she had defensive wounds, the way her body was contorted. and i just remember thinking she put up a heck of a struggle. she really fought for her life. >> do you think oh my goodness or have you seen everything at this point? >> i can't believe what people do to each other. it's terrible. >> reporter: around the back, cox, the crime scene tech, found the security bolt on a sliding glass door had been dislodged and there were other signs of tampering. >> there was a cable box that was opened. you start to think to yourself, somebody's trying to cut the