A Florida jury on Thursday found a former police officer, Nouman K. Raja, guilty of manslaughter in the fatal shooting of a black man who had been waiting for help on a highway after his car broke down, lawyers for the man’s family said.

One of the lawyers, Benjamin L. Crump, announced on Twitter that Mr. Raja had been found guilty of both counts against him: manslaughter by culpable negligence and attempted first-degree murder with a firearm.

The 2015 killing of the man, Corey Jones, a 31-year-old musician and housing inspector, drew national attention as one in a series of killings of black men by the police. The encounter also highlighted Florida’s so-called Stand Your Ground law, which Mr. Raja’s lawyer had cited in his defense.

[Update: Nouman Raja sentenced to 25 years in fatal shooting of Corey Jones.]

“This verdict is a vindication of the good man that was Corey Jones, and an utter repudiation of a criminal who tried to hide behind a badge,” the lawyers for Mr. Jones’s family said in a statement.