Turn The Crow on its head

Man who is tired of living, but unwilling or unable to kill himself is brutally murdered by ass-hats. A raven revives him. He spends more time trying to catch the bird and kill it than he does inadvertently doing away with his murderers. In taking out some of these goons, he earns the enmity of several gangs who, unfortunately, cannot kill him.

Addendum:

The bird should be a pigeon, as opposed to a raven.