A Fox spokesperson told the Los Angeles Times the network had no plans to re-air the episode, titled "Turban Cowboy," and had pulled it from online streaming on Fox.com and Hulu. The episode originally aired March 17 as the 15th episode of the show's 11th season.
"Turban Cowboy" had scenes of an attempted bombing of a bridge in Quahog, the fictional Rhode Island town where the Griffin family lives in "Family Guy," and a flashback showing lead character Peter Griffin winning the Boston Marathon by mowing down all of his competitors in a car.
The two violent events were shown in different parts of the episode, but the YouTube clip edited them together to suggest the episode predicted or inspired the bombings.
YouTube has since removed the edited clip.
The edited Family Guy clip currently circulating is abhorrent. The event was a crime and a tragedy, and my thoughts are with the victims.— Seth MacFarlane (@SethMacFarlane) April 16, 2013
A video showing the edited "Family Guy" content.