A former FBI agent was sentenced Jan. 4 to 18 months in prison for a 2011 drunken-driving crash that left an 18-year-old man dead.

Adrian Johnson, 39, of Brandywine, Md. was convicted in October of motor vehicle manslaughter and six related charges, according to the Washington Post. He was jailed immediately after sentencing and will receive 71 days of credit for the time he has served. He was sentenced in Upper Marlboro.

Authorities told the Associated Press that Johnson was intoxicated and speeding when he crashed his car into another vehicle in Brandywine on Feb. 7, 2011. The crash killed Lawrence Garner Jr. and seriously injured Garner’s friend, Robert Mitchell II as they were returning home from playing basketball.

Johnson’s defense attorney, Robert Bonsib argued that the crash was unavoidable. He also vowed to appeal the conviction.

“One matter of a few seconds has changed a lot of lives in this case,” Bonsib said in court, according to the Maryland Gazette. “Spending 10 years in jail is not going to bring anybody back.”

Garner’s father, Lawrence Garner Sr., spoke about his son shortly before the sentence was announced.

“The impact of losing my son, Jr., my namesake, my best friend, my everything, is the toughest thing I’ve ever had to deal with in my life,” he said. “He was a very humble, sweet, caring, strong young man who made me proud to say that he was my son.”