Did he finalize the team list? He may not have if the draft wasn't done yet. If he never finalized the team list you can delete this team and move on. You can tell if the team list is finalized if the "delete team" option is still available on your league page.
I hope you didn't pay this guy he has all the traits of a scammer, click on managers and you can see when he was last active then click on his profile and see how many leagues he is running, chance are if it's a pay league he is running more than one and is gone with the loot.