Updated at 3 p.m. Revised to include new information about a Dallas County District Attorney's Office complaint that led to Oliver's brief suspension in 2013.

Since a Balch Springs officer who killed a 15-year-old boy was fired Tuesday, a few details have begun to emerge, including a 2013 suspension following a complaint from the Dallas County District Attorney's office, which is now investigating the shooting.

Roy Oliver, 37, fired a rifle into a car full of teenagers as it drove away from a party Saturday night, striking Mesquite High freshman Jordan Edwards in the head.

Balch Springs Police Chief Jonathan Haber said he terminated the six-year veteran of the department for violating policies, though he has refused to provide specifics.

Oliver's attorney could not be reached for comment Wednesday, but a lawyer for the slain teenager's family said the officer plans to appeal his firing.

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Roy Oliver

Before becoming a peace officer in 2010 in Dalworthington Gardens near Fort Worth, Oliver had been on active duty with the Army since 2004. He served two tours in Iraq, from October 2004 to September 2005 and from January to November 2009.

He rose to the rank of sergeant and earned commendations, including a medal for good conduct. He also served in the Texas National Guard until 2012.

Oliver worked intermittently for Dalworthington Gardens over a span of 12 years. The city said in a prepared statement that he was hired in 1999 to work as a dispatcher, transferred to public works and then moved back to dispatch in 2002. He served in the city's Department of Public Safety less than a year -- from September 2010 until he resigned in May 2011.

Dalworthington Gardens officials said there were no complaints or disciplinary actions against Oliver while he was a public safety officer. As a dispatcher, he received an award for "meritorious conduct." But during his time in the public works department, he was put on a month-long probation for work performance, according to the city.

Oliver joined the Balch Springs police in 2011, and Texas Commission on Law Enforcement records show he received precision rifle training and took a class on the use of force.

His most recent training was a firearms course April 22 at the Police Department.

Oliver was suspended for 16 hours in 2013 after a complaint from the Dallas County District Attorney's office, according to his personnel records.

The complaint was over his conduct toward people in the office and in court. The prosecutor's office said that in once instance, Oliver was aggressive, using vulgar language that resulted in staff asking a female intern to leave the room. The office said that he later swore when asked a question in the courtroom.

Messages left with Oliver's attorney and with a spokeswoman at the prosecutor's office Thursday were not immediately returned.

Oliver, a 1998 graduate of Fort Worth's Paschal High School has at least two children, who were born in the summer of 2015 to two different women. He was divorced in 2013.

Roy Oliver's 1998 high school yearbook photo.

Oliver and his family have not spoken out about the case against him, and his attorney, Cindy Stormer, has said she cannot comment.

Several Balch Springs police officers said Wednesday that they had been told not to talk about Oliver or the shooting. A Balch Springs Police Association leader also has said the department's chief has instructed officers not to comment publicly about the case.

Although the department said its internal investigation has concluded, the Dallas County Sheriff's Department and Dallas County district attorney's public integrity unit are investigating to determine whether criminal charges will be filed.

"There were over 100 people present that are still being identified and interviewed by our detectives," the Sheriff's Department said Wednesday.

The white officer's shooting of an unarmed black teenager has renewed allegations nationwide that racial bias among police has led to deadly overreactions.

Eight out of 10 Balch Springs police officers are white — though 4 out of 5 five residents are not.

Jordan is the youngest of 333 people shot and killed by police in the U.S. this year, according to The Washington Post, which is tracking police shootings nationwide. In 2016, according to The Post, 963 people were fatally shot by police. In 2015, the number was 991.

Oliver was the second of two officers who responded to a report of underage drinking the night Jordan was killed.

After gunfire was heard in the area, the 15-year-old and four other teenagers got into a vehicle to leave.

Originally, police had said Oliver fired on the vehicle because it was backing up aggressively toward the officers. But the department revised its account after reviewing body-cam footage, saying the vehicle was driving away when Oliver shot.

The Associated Press and staff writers Naheed Rajwani, Terri Langford, Sarah Mervosh, Jennifer Graffunder and Eline de Bruijn contributed to this report.