I can't remember, but are you guys recalling the movie or the novel? It's in the novel that way. That I know
Yes Olivant, it was in the novel. But there is also a deleted scene which I believe was from The Saga, and is definitely on the extras disc in the Trilogy DVD set.
DonT - When the Don was hit, it was Clemenza who was the first to be suspected because in the book, and I believe in another deleted scene, Sonny calls Tessio and tells him to have his men guard the compound and the hospital. I even think that Tessio asks him "what about Clemenza and his people" and Sonny tells him that he only wants his (Tessio's) men. None of Clemenza's men are used for those jobs.