https://www.findagrave.com/memorial/62497147/birrell-walsh

On 10 February 1945, Capt. Slaughter flew as the Airplane Command Pilot (with COL Walsh as a Mission Observer) aboard a Boeing B-29 Superfortress nicknamed “Slick’s Chicks” (serial #42-24784), tail code: K-Triangle-18.

While over the target at an altitude of 28,000 feet, the group was attacked by a band of Nakajima Ki-44 single-engine “Tojo” fighter planes. During the attack his aircraft suffered a mid-air collision with another B-29 bomber (#42-24815), resulting in the loss of both aircraft and aircrews.