the kyne house was cramped with four extra people.ping out on couches because of financial troubles. kevin wasn't making things any easier, obnoxious about sharing the household computer. >> he was the computer hog. >> that's all he ever wanted to do, was sit on the computer. it wasn't even his computer, but he would change the passwords and kick everybody off. >> reporter: kevin's mother was furious. she'd stop talking directly to him, trying to avoid the persistent arguments. >> they're just talking via e-mails? >> completely. >> 30 feet across the house and they're communicating by e-mail? >> not even 30 feet at times. >> reporter: the last straw was kevin cursing out his mother in front of the encamped family. (. >> called her a [ expletive ], called her the "c" word." called her a retard. >> reporter: diane and bill gave kevin a deadline to get out for good, september 21st. but five weeks before that deadline day, diane was dead, and bill said kevin's temper and violent past pointed to him as the only one who could have done it.