Mr. Jingles(2006)

Determined to make the guilty parties pay for what they did, Mr. Jingles goes on a bloody killing spree, wreaking grisly havoc on the families of those who put him behind bars. But the homicidal clown had one witness who got away - and spent years in an institution trying to erase the gory memories. Now she is back and ready to join society again - but someone else is planning a very different homecoming!

Official site