The fire is now fully contained, but crews were continuing to work to put out hot spots.
Fire investigators have previously said they were examining several burned cars found in the area to determine if they might have been set on fire to destroy evidence of auto theft.
No further details will be released until the investigation is complete.
The fire broke out about 2 a.m. Sunday near a shooting range in the 1200 block of Little Tujunga Canyon Road. It charred 4,824 acres from the Angeles National Forest to Lake View Terrace in the San Fernando Valley.
The fire destroyed one home in the Dexter Park area, 38 mobile homes in Valley View Estates and five outbuildings, according to the Forest Service.
Assistant Coroner Chief Ed Winter said a homeless man and his dog burned to death Monday when flames consumed a makeshift wood-and-cardboard shelter near Paxton Street and Foothill Boulevard, near the interchange of the Foothill (210) and Ronald Reagan (118) freeways. The man has not yet been identified.