He did know. he was tired of runnung and knew he could run all his life and still not get away.He had to have known what tha mafia is capable of and he had to have known he could never truely escape.Death on the lake might have been a relief for him.He would no longer have to worry about his problems.

Ok now that I read what I just wrote, I think that might be giving him too much credit, but he DID know!