searching for an author - mind gone blank. Need help with former.

read book several years ago by a black comedy writer-male. The
particular book I read concerned a laid-off employee in a tight job
market who murdered his competition for a job in his field.He murdered
about 5, i think. He was known for black humor of this type.  I am
drawing a huge blank. If you know please pass it on. thanks in
advance.