A law enforcement officer whose social media video mocking basketball star LeBron James went viral has been fired, an Idaho official confirmed Thursday. Nate Silvester, who was working for the Bellevue Marshal’s Office when he made the video, was suspended in April while an investigation took place. He was later allowed to return to work but placed on probation. During the week of May 20, while working, Silvester violated several city and state policies, Mayor Ned Burns said in a statement. “After his previous policy violations Deputy Marshal Silvester was placed on probation and was on, what is called, a ‘last chance agreement’ with his superior officers. Because of his continued policy violations, the Marshal has terminated Mr. Sylvester [sic],” Burns said. The firing did not stem from the former officer’s social media posts, the official said. “The policy violations have nothing to do with the tone or the tenor of his …