Philip Seymour Hoffman

Sure, if he wasn't a corpse.

I honestly don't. He could've done it, but he was a little too smug/self assured of himself irl. As seen by how he did heroin in the middle of filming a movie, and then on top of it didn't consider he'd OD. Fraser was just emotionally raw and... I don't know, beaten down? You needed someone slightly dopey and clueless to play the character. Hoffman would've done a fine job but he'd be performing, without that level of self shame Fraser brought to it slightly.