Authorities in Virginia arrested a suspect Monday in the murder of a Federal Bureau of Investigation police officer who was gunned down in front of his house as he left for work, The Free Lance Star reported.

Antoine Gray Johnson, 26, from Upper Marlboro, Md., confronted the police officer, Jeremy Brown, who was in uniform, outside his Stafford, Va., home early Monday, police said. The two reportedly exchanged words, which led to an exchange of gunfire. Brown was killed.

The report said the two men knew each other, but authorities would not describe what led to the confrontation. Police reportedly considered the shooting an isolated incident.

Johnson was taken into custody shortly after the shooting and police said they found the same caliber handgun used in the killing inside the vehicle he was driving, the newspaper’s report said.

The report said Brown has worked for the FBI police force since 2009. Johnson is being held without bail at Rappahannock Regional Jail.