After a mild-mannered coroner awakens to find he’s become a zombie, not even a decaying body or a band of rogue survivors can deter thoughts of his unfaithful wife: he’s gonna kill that bitch.

Sounds fun!

My stab at it- When a murdered coroner awakens to find himself a zombie revenge against his faithless wife is the only thing on his mind.

Gab, in your version I'm not sure what 'rogue survivors' are survivors of? And the fact that he is a zombie makes 'decaying flesh' a given so I don't think you need that description. The impediment to his success might be that he is the only zombie in town and has to remain incognito while trying to revenge his death...?

I understand that loglines should be short and to the point...however, I felt it necessary to include an actual antagonist (decaying body and rogue survivors) rather than implied. I'll consider your edit though. Thanks for the feedback.

@Anton: I thought about the use of the word bitch, but hey, you have to have that shock value. =)

There is a possibility of someone being off put by the use of bitch, but it's quite an attention grabber! I'm intrigued, so good job.