William Perry Jr. (May 31, 1965 – August 7, 2023), better known as DJ Casper (also known as Mr. C the Slide Man), was an American disc jockey. Born and raised in Chicago, he was known as "Casper" due to frequently being clad in all white attire on stage. He was best known for his 2000 single "Cha Cha Slide".
