The Billings man injured in a late-April apartment fire has died.
Assistant Fire Marshal Bill Tatum, with the Billings Fire Department, said on Monday that Frank Grayson, who was in his 70s, died Saturday at a Utah burn unit.
After being taken to St. Vincent Healthcare with burn injuries, Grayson was flown in critical condition to a specialized burn center in Salt Lake City.
The April 22 fire started in a second-floor apartment at Sage Tower Retirement Apartments, 115 N. 24th St., where Grayson lived.
His exact cause of death wasn't immediately available. Tatum said that a coroner would determine that information but that it wasn't clear if the autopsy would be performed in Utah or Montana.
The fire's cause remains under investigation, and Tatum said that, as of 2 p.m. Monday, it was not a criminal investigation.