Thomas H. Lee at a panel discussion in 2009.
Thomas Lee, founder of Thomas H. Lee Capital, speaks at a panel discussion at the 2009 Milken Institute Global Conference in Beverly Hills, California.
  • A family spokesperson announced Thursday that Thomas H. Lee died. He was 78.
  • NYPD told Insider a man was found dead in the office but did not confirm the identity.
  • "The investigation remains ongoing at this time," an NYPD spokesperson wrote in an email.

Billionaire investor and financier Thomas H. Lee has died, according to a statement published Thursday from family spokesperson Michael Sitrick. He was 78.

Sitrick declined to comment on the cause of death.