LOS ANGELES—Police say a 69-year-old man has died a day after a blaze being investigated as arson roared through a 90-year-old residential hotel in the harbor area of Los Angeles.

LAPD spokesman Bruce Borihanh says homicide investigators were dispatched Wednesday to investigate the fire that broke out early Tuesday at the Palos Verdes Inn and injured 13 other people.

The victim's name is not being released, pending notification of his family. He died of his wounds Wednesday afternoon.

Firefighters returning from a nearby medical call saw smoke at the hotel before any 911 call had been received at about 3:30 a.m. Tuesday and began responding.

Arson investigators were sent to the scene because of the fire's size and how quickly it spread. The cause remains unknown.