A father behind an horrific act of violence which left one woman dead and another traumatised for life has been identified as Keith Mitton. Mitton stabbed his partner of about six months at a home in Exeter, a small town about 20 minutes from Launceston, on Friday afternoon. Perth man Keith Mitton stabbed his partner and killed another woman in a crash on Friday. Credit: 7NEWSPerth man Keith Mitton stabbed his partner and killed another woman in a crash on Friday. “We had been trying to get him help for months and months and months,” Woody Churchill said.