Media | Brian Williams Brian Williams Cancels Letterman Appearance Embattled NBC anchor still on hiatus By Rob Quinn Posted Feb 9, 2015 12:03 AM CST Copied Brian Williams speaks at the 8th Annual Stand Up for Heroes event in New York last fall. (Photo by Brad Barket/Invision/AP, File) Looks like David Letterman will have to save that "Top 10 Things That Really Happened to Brian Williams' Helicopter" list for another time: The NBC anchor has canceled his scheduled Thursday appearance on the Late Show, reports the Los Angeles Times. An NBC exec says the anchor, who's on hiatus amid questions over Iraq and Hurricane Katrina stories, decided to pull out of the Letterman appearance because it's not clear when he will return to NBC Nightly News. In 2013, Williams appeared on Letterman's show and shared his false story about being in a helicopter that was hit by RPG fire in Iraq, Mediaite reports. Read These Next Iran's supreme leader makes first public comments since ceasefire. Her blood isn't compatible with anyone else's. Man accused of killing his daughters might be dead. Trump's spy chiefs back up his Iran claims, citing new intel. Report an error