JACKSONVILLE, Fla. -- An elderly man is dead and two Jacksonville Sheriff's Office detectives are on administrative leave after an undercover narcotics investigation ended in gunfire late Saturday.

According to the JSO, detectives Donald Maynard and James Narcisse had been working undercover for about three hours in the 2300 block of Westmont Street when 80-year-old Isaac Singletary approached them with a gun just before 6 p.m.

The officers said they ordered the man to put down the gun. However, Singletary did not drop his weapon and gunshots were exchanged.

Singletary was shot several times. Paramedics rushed him to Shands-Jacksonville Medical Center, where he died.

Less than 24 hours after the fatal police shooting left his uncle dead, Gary Evans told Channel 4 he's mad.

"Eighty-years-old, and they had to shoot him twice or more in order to subdue him. I'm very upset about it," Evans said.

He said his uncle was territorial and mad about the drugs on his street, and would often take his gun and try to scare the drug dealers away.

On Saturday, things went terribly wrong.

"My uncle asked the officer, which he didn't know at the time he was a police officer, to leave his property and he didn't," Evans said.

Neighbors told Channel 4 that Singletary was very protective of his property.

"You don't expect somebody to come pointing a gun at you, and once they do that, the officers will tell them to drop the gun," JSO Chief Dwain Senterfitt said. "We're still investigating what statements were made, but obviously, at that point, the officers' lives were in danger."

Police said they are still trying to figure out if the undercover officers had time to tell Singletary they were undercover officers. They said the detectives had to hid behind a tree to avoid being shot by Singletary.

According to police, the officers had been in the neighborhood since about 2:45 p.m., and had made five drug-related arrests.

"In the course of our undercover activity and making several arrests in this neighborhood, a man we now know to be a resident of that area, Mr. Isaac Singletary, was shot by officers," said Director of Investigations and Homeland Security Micheal Edwards.

Saturday's shooting was the third JSO-involved shooting in three weeks. Unlike last week's case at the Sable Palm Apartments, there is no dispute whether Singletary had a gun.

"There was a confrontation between them and an exchange of gunfire," Edwards said.

However, the question of who fired the first shot remains unanswered.

"He shot at my uncle first. He was the first one to shoot, and my uncle returned fire," Evans said.

"As you know, our investigation into any shooting must be thorough and methodical. At this time, there's a limited amount of information we can share," Edwards said.

As the details of the shooting are being hashed out, scared neighbors and sad family members remember Singletary.

"I looked in his eyes I saw his pain. I felt the pain for him. He never bothered anybody. He's never done anything to anybody. He didn't want anybody in his yard," said neighbor Antionette Douglas.