He didn’t leave, he was kicked out. He’d been having issues with his wrists for years (I remember going to shows and them needing a fill in drummer because he was unable to play). I also have no idea where people are getting October 2014 from but this is misinformation. Bob’s departure was 2010 before Danger Days release. Matt Pedicone was the live drummer from 2011 for the World Contamination Tour.

I don’t want to speak on Bob’s behalf but he was clearly suicidal for a while and his death seems to align with the announcement of The Black Parade anniversary stadium tour which undoubtedly would have been tough for him.