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.

[1] Born and raised in Chicago, he was known as "Casper" due to frequently being clad in all white attire on stage.

[5] "Cha Cha Slide" was later picked up by Universal Records and became a global hit, most notably in the United Kingdom, where it topped the UK Singles Chart in March 2004 and became Britain's third best-selling song of 2004.

[3] Perry made an appearance as a DJ in a season 6 episode of Orange Is the New Black, in Crazy Eyes' hallucination of the prisoners and guards line dancing to the Cha Cha Slide.

"[10] Perry died of kidney and liver cancer on August 7, 2023, at the age of 58.