 Your emergency situation station. Charlotte-Mecklenburg police today mourning the loss of another officer. A little over two months ago, after that deadly ambush in East Charlotte, they killed four cops. CMPD K-9 officer Brett Simpson has died, passed away from a self-inflicted gunshot wound. He'd been with the department 18 years, most recently assigned to the K-9 unit, also served in the U.S. Navy.