DETROIT — Pittsburgh Steelers wide receiver DK Metcalf will not face charges for grabbing a Detroit Lions fan’s shirt and pushing him back during a game in December, according to the Wayne County Prosecutor’s Office. Lions fan Ryan Kennedy, 45, was allegedly heckling Metcalf from where Kennedy sat behind the Steelers’ bench. Kennedy left his seat with a Metcalf jersey to get an autograph, according to prosecutors, and said something to the player as he approached him. There was a brief interaction where Metcalf grabbed Kennedy’s shirt and pushed him back, according to prosecutors, though earlier reports said Metcalf punched Kennedy. Kennedy was not injured, according to prosecutors. There was no in-game punishment for Metcalf. The Steelers’ leading receiver by a considerable margin rejoined his team on the sideline after the altercation and reentered the game. He was suspended for two games without pay by the NFL the day after the Lions-Steelers game.…