A former member of a violent drug ring in D.C. was sentenced to 45 years in prison for killing a man he mistakenly thought was an informant, authorities said Friday.

Michael Walters, 31, of D.C., was convicted by a jury in March of conspiracy and first-degree murder while armed, among other offenses, according to U.S. Attorney for the District Ronald C. Machen.

He was one of two men authorities said killed Michael Henry, 25, in August 2008. 

Walters was a member of a drug organization that operated in Southeast for a number of years selling PCP, cocaine, marijuana, and ecstasy, authorities said.

After police raided an apartment the drug ring used in 2008, authorities said, the members mistakenly concluded that Henry had tipped off the police. 

That August, Walters and Shawn Curry, 24, ambushed Henry, chased him through multiple courtyards in Southeast, and fired more than 30 shots at him, authorities said. Struck twice, Henry died on the scene.   

The other three defendants in the case, all from D.C., were sentenced in May. Javon Roberts, 34, the ringleader, was sentenced to 48 years in prison; Curry was sentenced to 42 years; and Alonzo Marshall, 24, was sentenced to 37 years.