Kyle Williams, the San Francisco 49ers' wide receiver whose two fumbles may have caused the team a chance at the Super Bowl, has said he takes the blame for mistakes.

The New York Giants secured a spot in the Super Bowl with a 20-17 victory.

You have to take full responsibility for it, which I do, Williams said, as reported by the Mercury News. It's something I made a mistake on. I'll move through it. I promise you that.

Following the 49ers overtime loss in the NFC Championship game on Sunday, Williams was receiving death threats and hateful posts from fans on Twitter. The second-year wide receiver was put in place to handle punt return in Sunday's game because Ted Ginn Jr. was injured.

The Fourth Quarter

Williams managed to let a punt drop near him and the Giants fell on it in the fourth quarter. Thought the 49ers were originally awarded the ball, replays showed that Williams' knee brushed the football as it landed.

The ruling was challenged by Giants coach Tom Coughlin and the play reversed. The Giants later scored a touchdown and took over the lead.

Paid no attention to Twitter

But Williams said he didn't pay much attention to Twitter.

It's a different story for Kenny Williams, the general manager of the Chicago White Sox and Kyle's father. He was peeved at the Internet hatred sent in his son's direction.

Kenny Williams told ESPNchicago.com that having to hear about threats on his son makes you question our culture of sports as it stands.

Kenny Williams, a former major league outfielder, said his son suffered a shoulder injury in the third quarter against the Giants, neither of the two used that as an excuse.

I'm used to the years of criticism and threats on my life from time to time, but I have to hear about threats on your son's life while you're watching TV and it certainly makes you question our culture of sports as it stands, Kenny Williams told ESPNChicago.com. I told his mother on the way out exactly what was coming. That's the nature of the beast.

The father said his son spent Monday getting treatment for the shoulder.

The Mercury News reported that coach Jim Harbaugh said that medical evaluations on Monday didn't show a major injury.

He's sore, but there's no shoulder separation, Harbaugh said.

The threats

Among some of the threats sent in Kyle Williams' direction were:

I hope you, youre wife, kids and family die, you deserve it.

Kyle Williams better keep one eye open... Im gonna bust both that dudes kneecaps see if he ever plays in red and gold again.

(San Francisco coach) Jim Harbaugh, please give @KyleWilliams_10 the game ball. And make sure it explodes when he gets in his car.

BAH!San Francisco 49er kick returner Kyle Williams attempted to shoot himself after today's game but he dropped his gun.

I doubt I will ever forgive kyle williams #jackass.

But Williams said that all the feedback he needed was from his family, his friends and the guys in the locker room.

That was all I needed, because that's really all that matters when you come down to it -- the guys who are wearing the same jersey and the family and friends who were close by, Williams said.