He felt it was best to leave.

He's been looking for some time to retire from the radio station.

That was never indicated to us.

I've been dying to work with Simon since I saw Shaun of the Dead,

Watch the behaviour of the actors,

That was an incredible challenge, ... Though the lack of development was one of the greatest assets for Lost - we didn't have time to second-guess what we were doing and sanitise it into a more middle-ground story. When it aired it ended up getting three times the audience they expected. It was mind-numbing - I just couldn't believe it.