Is alcohol the main cause of Ryan Dunn’s death?

Even after the release of the preliminary autopsy results by the coroner's office, questions remain about whether alcohol played a role in the crash.

Chester County Coroner's Office spokeswoman Patty Emmons said the toxicology results that will help decide whether alcohol was factor, will take up to 6 weeks to be released.

The MTV star tweeted a pic of him drinking beer with several friends at a pub in West Chester, hours before the crash. The photo has since been taken down.

Movie critic Roger Ebert posted on Twitter not long after news broke of Dunn's death, friends don't let jackasses drink and drive. This post drew criticism flooding Ebert's Facebook page with derogatory posts. Ebert soon apologized for the tweet, saying that he didn't mean to be cruel and was probably too quick to tweet.