assistant state attorney bill loughery describes what kevin did next. >> the police showed up.d even was trying to have his dog attack the police during it, and so he was arrested for battery on law enforcement officer and resisting arrest. >> reporter: kevin pleaded guilty. and now deputies from pinellas county were back at the house, this time investigating the murder of diane kyne. bill, who'd said his son did it, was painting a picture of kevin's violent past. >> i had never seen anybody act the way that kevin acted out. >> reporter: just three months before, bill said kevin had brandished a knife against his mother. >> he was frustrated about something and said, "you're going to listen to me." he had a knife in his hand. and it scared the heck out of her. >> reporter: kevin says that never happened. another time, kevin's mother bolted her bedroom door to keep him out. >> he kept pounding on the door and pounding on the door and he finally kicked it in. and it broke the door. >> reporter: was bill deflecting attention away from himself? or telling the truth about the man he