The 63-year-old man, identified as Jerry Payne of Long Beach, died at about 2 a.m. Monday, according to the coroner's office.
Payne was entering a 7-Eleven store on the 5100 block of Pacific Coast Highway on Friday at about 5:15 p.m. when he was approached by a transient asking for money. He said no.
As Payne came out of the store and entered his vehicle, the transient reportedly doused the victim and the inside of his vehicle with a flammable substance and lit it on fire.
A 38-year-old homeless man, Raymond Sean Clark, was arrested shortly after the crime. Police say the two men did not know each other. Clark will be re-booked for murder.
City News Service contributed to this report.