© Twitter/William J. Clinton Presidential LibraryMark Middleton • Former President Bill Clinton and Jeffrey Epstein
Middleton is known for cementing the former president's friendship with Jeffrey Epstein.

The cause of his death was not confirmed. Middleton ran an air conditioning business in Little Rock, Arkansas for decades before becoming a special advisor to Clinton and financial director for his Presidential Campaign. A representative of Middleton Heat & Hair, in a Facebook post, wrote:
"The Middleton family has lost an inspiring and dedicated leader, as well as a son, brother, husband, and father. Mark leaves behind a company that he helped build from the ground up alongside his family and was proud to run for the last 25 years. No words can express our sadness over this loss or our gratitude for your support and prayers during this time."
During his time with Clinton, he reportedly invited Epstein to the White House for at least seven of Epstein's 17 visits. Middleton may have also flown on Epstein's plane and connected the two powerful men.

He was also a managing partner of the MidCorp Capital investment firm and worked on multiple nonprofit foundations. While assisting President Clinton, Middleton also worked under then-chief of staff, Thomas "Mack" McCarty.

In February 1995, Middleton left the White House. The following year, an investigation by the White House found that he had abused his access to impress business clients and he was barred from the property without senior approval. He would deny these claims.

Middleton is survived by his wife Rhea; his two daughters Lindsay and Lauren; father Charles Middleton; mother Anita Middleton-Kellar; brother Steven Middleton and sister Sandra Leeann Middleton-Marshall.

Instead of flowers, the Middleton family is asking mourners to donate to Navigate Counseling and Wellness, a service that specializes in counseling and therapy in connection with the New Life Church.