Thornton was assessed a match penalty for an incident at 11:06 of the first period during Boston's 3-2 win over the Pittsburgh Penguins on Saturday at TD Garden. During a stoppage in play, Thornton attacked Penguins defenseman Brooks Orpik, slew-footing him to the ice and punching him twice in the head.
Orpik suffered a concussion and was taken off the ice on a stretcher and transported to the hospital. He was released shortly after and cleared to return with the team to Pittsburgh.
Because Thornton received a match penalty, he did not travel with the Bruins on their road trip and is suspended until his hearing. A suspension would be the first of Thornton's career.