A convicted killer in Oklahoma was executed Thursday despite his lawyers arguing he was mentally ill and unaware of his imminent death. Benjamin Cole, 57, was pronounced dead at 10:22 a.m. local time at Oklahoma State Penitentiary in McAlester, attorney Tom Hird told The Post. Cole was sentenced to death in 2004 for the Dec. 20, 2002, murder of his 9-month-old daughter. CNN reported after the baby’s cries interrupted Cole’s video game, he broke her spine.