Bungie Chief Operating Officer Pete Parsons refused to comment on the specifics of the decision but said that the game is still on track for release. He said that O'Donnell's contributions will remain part of the soundtrack, which is also being worked on by a few others.
"We have a fantastic team. We're pretty close to shipping. There's a lot of polish left to do, lots of tweaking and tuning, but a lot is already complete," Parsons said to Eurogamer.
Bungie claims that the studio and O'Donnell parted as "friends" while the composer tweeted yesterday that he was "terminated without cause."