By Reuters

(photo: Reuters)

* Officer had taser on him at time of shooting *

*Man ran at officer, did not stop when ordered to *

*Police chief: Man may have had mental illness*

A white, Atlanta-area police officer shot dead a naked and unarmed African-American man acting erratically in his apartment complex and who was possibly suffering from a mental illness, the county police chief said.

A Dekalb County police officer responded to a caller who said a man was “acting deranged, knocking on doors, and crawling around on the ground naked,” on Monday around 1 p.m. local time, county police chief Cedric Alexander told reporters.

The officer encountered the man, who was not wearing any clothes, in the parking lot, Alexander said at a conference published online by local broadcaster Fox5.

Alexander said the man ran at the officer, who backed up and ordered the person to stop before shooting him twice. Police did not find a weapon at the scene, he said.

Monday’s shooting comes after a string of killings of unarmed black men by police in the United States. Last year, incidents in Ferguson, Missouri and New York City prompted nationwide protests, some of which turned violent.

This is at least the third African-American man to be shot dead by police since last Friday, who either was or seemed unarmed.

Read More Anthony Hill, Unarmed, Naked Black Man, Fatally Shot By Police Near Atlanta.