(KRON) -- The Antioch Police Department is asking for the public's help in locating an at-risk missing man. Frederick Walker, 37, is described as 6 feet 1 inch tall, and weighing 180 pounds, with brown hair and brown eyes. Frederick Walker (Photo courtesy of APD). In a social media post Thursda y, ADP said that Walker does not have a cell phone. Anyone with information on Walker's whereabouts is urged to call Antioch police at (925) 778-2441 or 911 ...read more read less