A doorbell camera captured the moment an Indianapolis police officer opened fire on an armed man shortly after a 911 caller said he threatened her with a handgun.

Lemar Qualls, 35, was killed by a hail of bullets unleashed by Officer Ivan Flick when Qualls pointed a gun at him while sitting on the woman's porch around 2:15 p.m. on May 2, police said in a video presentation posted on YouTube on Thursday.

Flick's body camera wasn't activated at the time but a doorbell camera recorded the deadly confrontation on the 3900 block of Broadway Street, police said.

It shows Flick walking up the steps to the porch as Qualls sat on a chair, holding a gun, and said, "You know me. I wouldn't do this if it wasn't what I think it is. If I'm wrong, tell me please."

"Hands up! Hands up!" Flick said.

When Qualls raised the gun he was holding, Flick fired multiple rounds at him, the video shows.

Police said Qualls pointed the gun at Flick.

It's unclear if he had his finger on the trigger.

A still image highlighted in the video presentation showed that Qualls' gun slid across the floor and stopped near Flick's foot, police said.

Flick's partner, Officer Randall Buck, whose body camera was activated, also opened fire from the lawn during the incident, according to his footage.

During the 911 call that preceded the shooting, the caller described Qualls as an "intruder" who "has a gun," according to the video presentation.

"He just put it in front of my face, and he clanked it up against a metal bar to let me know it's real," the caller said. "He's currently on my porch trying to, like, solicit electronics for sale but he's kind of like babbling all crazy stuff."

Witnesses have told local TV stations Fox59 and CBS4 that Qualls was experiencing a mental health episode at the time.

Indianapolis police have said the incident was under criminal investigation by its Critical Incident Response Team and was also the subject of an internal affairs review.

In Thursday's video, the police said the investigation was "still in its early stages" and "may take a year or longer" to complete.

Earlier this month, the U.S. attorney's office in Indianapolis said the Justice Department was reviewing officer-involved shootings in the city, including seven this year, six of which resulted in the deaths of suspects, according to Fox 59.