Cop killer says he shot police officer accidentally – on a court whiteboard

A gunman who shot dead a Met Police sergeant in a custody centre insisted he did not mean to kill the officer when he gave evidence using a court whiteboard. Louis De Zoysa, 25, blasted 54-year-old Pol Sgt Matt Ratana with his hands cuffed behind his back after his colleagues failed to find the weapon when they searched him. The New Zealand-born officer was just two months away from retiring when he was killed in the early hours of 25…