A New York man who murdered his wife and two kids before committing suicide was under significant stress at the time of the slayings, WABC-TV reports. Investigators say 46-year-old Chuan-Kai Liu, who informally went by the name Tom, killed his wife, 42-year-old Dorothy Liu, and their children, 7-year-old Tennyson and 4-year-old Adeline. All three were stabbed …