John C. Reilly could've played McNulty on The Wire

The A.V. Club

David Simon revealed how Reilly was almost cast in Jonathan Abrams' new oral history book All the Pieces Matter, which GQ has an excerpt out specifically focusing on the casting of each character. "I thought John C. Reilly could be a different McNulty, certainly not the same, but I thought he could carry all of the excesses and vices of McNulty in a different way," said Simon. "I've loved his work in a lot of stuff."