It was a fumble that ultimately ended the San Francisco 49ers’ shot at the Super Bowl.

Kyle Williams’ overtime slip-up set up a 31-yard field goal for the New York Giants that cost the 49ers the NFC Championship 20-17 on Sunday.

But while Williams’ teammates have rallied around him, crazed football fanatics are spewing an alarming number of death threats on Twitter at the player they say is to blame.