A homeless man died after being doused with gasoline and set on fire on a street where he had lived for many years and was a familiar face to residents of Koreatown in Los Angeles, police and local merchants said Friday.

Police were called to Third Street west of downtown Thursday evening and found the man, who was pronounced dead at a hospital.

A man in his 20s was seen throwing gasoline on the man, chasing him, throwing more on him and running from the scene, said Deputy Chief Sergio Diaz. Scorch marks stained a wall Friday where the man was burned.

The burning horrified even officers who routinely witness violent crimes, Diaz said.

"To murder somebody who's probably suffering from mental illness issues and not bothering anyone — just a poor wretch on the street —you've got to be a soulless nitwit to do something like this," he said.

The victim remained unidentified, and coroner's investigators might have to rely on fingerprints, Diaz said. Investigators canvassed the neighborhood Friday looking for evidence, witnesses and information about the victim.