Mordecai, the Dancing Yiddish Clown is a Jewish man who works at parties, weddings, and other events as a clown.
He was accidentally killed by Peter Griffin after he crashed his boat, the S.S. More Powerful Than Superman, Batman, Spider-Man, and the Incredible Hulk Put Together into a wharf, on which a Bar Mitzvah was being held in "A Fish out of Water". The Bar Mitzvah boy exclaims that the clown has been killed, and is told by his father he had just became a man, to act like one. Eventually, Stewie and Harelip Steve had to try to get the clown's corpse off of the bow of the boat.
The crash was caused by following fake coordinates to a supposed prolific fishing spot.