Tbh he sounds like a tosser off the highest order. If he went to the effort of luring the cat in, he could have taken the time to drive it off somewhere and let it free. If the animal is to be put down, then it takes some sick person to hang it.
Hey Chesterfield - I couldn't agree more, they also had days to cool down and act more rationally. However, the point I am trying to make is that for somebody to do this and leave the cat on the owners lawn suggests that it somebody they know who has some kind of vendetta against them. Why go to the trouble of leaving it in the lawn otherwise?