From Liam Neeson's IMDb page:

On 11 July 2000 he fractured his right pelvis and chipped his left pelvis and sustained multiple abrasions to his legs after hitting a deer while riding his 1989 Harley-Davidson motorcycle in Connecticut. He was thrown off the motorcycle just before it smashed into a nearby tree. A passing motorist found him crawling along the roadside. Due to this accident he was unable to appear as a "Force Ghost" in Star Wars: Episode II - Attack of the Clones (2002), and is only heard as a disembodied voice in the scene following Anakin's slaughter of the Tusken Raider Camp.

Has anyone brought this up on here before? Because I don't remember anyone here doing so.