ATLANTA -- Atlanta police have issued a warrant for a man they say sold narcotics to an undercover agent at the home of an elderly woman who was killed later in a drug raid.

Police say drugs also were found in Kathryn Johnston's home after she died in a shootout in which three officers were wounded while serving a search warrant Tuesday night.

Assistant Police Chief Alan Dreher said yesterday that after police identified themselves and knocked down the woman's door, she started shooting. They returned fire and Johnston -- who police say was 92 -- was killed.

Neighbors and relatives say the police had the wrong house.

Wednesday night, police issued a "John Doe" warrant for the arrest of a man in his early to mid 30s, known only as Sam, who allegedly sold the drugs to the undercover agent Tuesday afternoon. Officer Joe Cobb, a police spokesman, said the type of drug sold and found in the home later would not be disclosed until it is verified by the crime lab.

District Attorney Paul Howard said his office has launched its own independent investigation. But he says a preliminary review shows the officers "had a legal right" to search the home.

Neighbors say Atlanta Police made a big mistake if they suspected there was drug activity at Johnston’s Northwest Atlanta home and they believe there should be consequences.

“She was an outgoing, nice person,” said one of 92-year-old Kathryn Johnston’s Neal Street neighbors.

Her neighbors are devastated after Johnston was shot and killed by Atlanta Police when they were trying to serve a search warrant for suspected drug activity at the home. Johnston opened fire on the officers – wounding three of them. They returned fire, killing her.

“I’ve been crying all night for her, her family,” said neighbor Mickey Rushin.

Atlanta Police say there was an undercover drug buy at Johnston’s Neal Street home from a male who has not yet been located. People who live nearby, say no way.

“Never. Never – this was a 92-year-old lady who lives by herself, she don’t know no young folks like that,” said neighbor Tony Terrance.

When Atlanta Police broke down Johnston’s door, investigators say the elderly woman started shooting and they had to return fire to protect themselves.

“There should’ve been better investigative work on the front-side, so we didn’t this kind of tragedy on the back-side,” said Rev. Markel Hutchins.

Rev. Hutchins said he had heard from people in the community that there was drug activity in the neighborhood, but never at Johnston’s home.

Residents say the police side of all this just isn’t adding up.

“Why would she have just started firing if they said they were the police,” said Terrance.

Neighbors say they are mourning a woman who was friendly, and who had been living in her home by herself for 17 years.

“It was frightening and it’s still frightening,” said a fellow neighbor.

Rev. Hutchins is urging people to gather outside Johnston’s home at 8:30 p.m. tonight for a prayer session.

READ MORE: Shooting Of 92-Year-Old Woman "Tragic, Unfortunate"