Firefighters respond to an apartment fire Monday in Southeast Washington. (D.C. Fire Department/D.C. Fire Department)

A D.C. man died after a fire at a third-story apartment Monday morning, authorities said.

The fire was reported about 8:45 a.m. in a garden-style apartment complex in the 4700 block of Benning Road SE, in the Benning Ridge neighborhood.

Vito Maggiolo, a fire department spokesman, said the fire was contained to a single apartment on the third floor, where firefighters found an injured man, who was alone in the apartment.

A spokesman for D.C. police said the man later died. He was identified as 72-year-old Reginald Beckham of Southeast.

The fire was quickly extinguished, and Maggiolo said investigators were searching for a cause. Firefighters also said a cat was found dead.