Acting U.S. Attorney Joon Kim said in a statement on Thursday that there wasn't sufficient evidence to bring civil rights charges against the officers involved in the 2011 shooting of 68-year-old veteran Kenneth Chamberlain in White Plains, just north of New York City.

In 2011, White Plains police officers showed up at Chamberlain's home after he inadvertently pressed the medical alert button in his apartment. When police arrived at his unit, he told them he didn't call them and he was fine, and he refused to open the door. According to the Associated Press, he also called the dispatcher from the medical alert company, Life Aid, so they could call off the cops. 

"I have the White Plains Police Department banging on my door, and I did not call them and I am not sick," he said.

However, it was too late. During the 90-minute standoff, police allegedly taunted the former marine and corrections officer with racial slurs and Chamberlain reportedly armed himself with a knife. 

“I’m a sick old man,” Chamberlain said. And Officer Stephen Hart replied, “We don’t give a f**k, nigger!”

Police entered the apartment by snapping the locks reported The New York Times. Officers then fired their tasers, and beanbags from shotguns. Apparently, they said they saw Chamberlain grab a knife, and an officer identified as Anthony Carelli fired his handgun.

Since the shooting, a state grand jury declined to indict any of the officers involved. Kim said that Chamberlain was threatening officers with a kitchen knife and that the shooting was justified. This led to the U.S. attorney in Manhattan opening an investigation.

“Officer Carelli believed that Sergeant Martin was in danger of being seriously injured by Mr. Chamberlain," said Kim.

"The investigation revealed no evidence to refute Officer Carelli’s testimony that he shot Mr. Chamberlain in response to his belief that Sergeant Martin was in danger of being seriously physically injured by Mr. Chamberlain.”

Despite the officers' story of the shooting, a medical expert previously testified that the White Plains police sergeant shot the 68-year-old in the back with a beanbag shotgun before another officer fatally shot Chamberlain, according to New York Daily News. The medical examiner also said Chamberlain couldn't have been holding a knife at the time of his death.

Chamberlain's family was dealt another blow when their civil suit was rejected by a jury in 2016.