Bam Margera, who is grieving over the death of his friend and Jackass costar Ryan Dunn, is blasting film critic Roger Ebert for, what many are calling, an insensitive Tweet.

Dunn and his passenger were killed in a car accident in Pennsylvania early yesterday morning after he lost control of his 2007 Porsche 911 GT3. Just hours before the accident, the Jackass star had posted a photo of himself on Twitter drinking with pals at a bar.

In response to Dunn's death, film critic Roger Ebert Tweeted:

    "Ryan Dunn, RIP. His Porsche flew through 40 yards of trees...Friends don't let jackasses drink and drive."

Following Ebert's Tweet, Margera Tweeted the following:

    "I just lost my best friend, I have been crying hysterical for a full day and piece of s*** Roger Ebert has the gall to put in his 2 cents about a jackass drunk driving."

Read what else Margera Tweeted ... after the jump.