Thomas H. Lee, Leveraged-Buyout Pioneer, Dies of Apparent Suicide

Private-equity pioneer Thomas H. Lee died unexpectedly at 78, his colleagues and family said late Thursday.

New York Police Department officials said first responders to an emergency call Thursday morning from Mr. Lee’s office assistant found him dead inside a bathroom in his office at 767 Fifth Ave. with what officers believe was a self-inflicted gunshot wound to the head. A gun found with Mr. Lee was registered to him, the officials said.