Amtrak police officer charged with murder in Chicago shooting

By Timothy MclaughlinCHICAGO (Reuters) - An Amtrak police officer has been charged with murder after fatally shooting an unarmed man who had been spotted smoking marijuana outside Chicago's Union Station train terminal, a police statement and court documents showed on Friday.Laroyce Tankson, 31, shot Chad Robertson, 25, on Feb. 8 at around 8:40 p.m. local time, the police statement said.Robertson was transported to a hospital in serious condition and died on Wednesday.