The trial of a man accused of killing his mother and wounding his father in Cambridge has been put on hold for at least another year while he undergoes psychological treatment. Judge David Ellwood of Guernsey county common pleas court decided to delay David Mallett's trial after a mental evaluation found he suffers from a severe mental illness that has gone untreated. The evaluation also found that Mallett's competency could be restored with treatment, making him fit to stand trial. The 33-year-old Mallett, of Byesville, pleaded innocent by reason of insanity last November in the October 12th shooting at his parents' home in Cambridge. 54-year-old Janie Lou Mallett died from a shot to the chest. 57-year-old Raymond Mallett was shot several times but survived.