The Memphis Police Department announced Sunday the name of a person suspected in the killing of a Tennessee officer Saturday. Memphis Police Officer Nick Koonce makes a pencil rubbing from the memorial wall at the National Law Enforcement Officers Memorial, May 15, 2009, in Washington, D.C. Getty

Memphis Police said Sunday they are searching for 29-year-old Tremaine Wilbourn as a suspect in the fatal shooting of Officer Sean Bolton, reported WMC in Memphis. Wilbourn has a warrant out for his arrest for first-degree murder.

Police said Wilbourn was the passenger in a 2002 Mercedes-Benz during a traffic stop for illegal parking. He reportedly got in a brief struggle with Bolton, 33, who died from multiple gunshot wounds. Memphis Police said they believe Bolton happened into the middle of a drug transaction. Less than two grams of marijuana were reportedly found in the vehicle. Both the suspect and driver fled the scene, but the driver turned himself in and was later released, according to WMC.

Bolton was discovered critically wounded Saturday night and later died in the hospital. Police said a citizen used Bolton's radio to report the shooting. He had been a member of the force since 2010. "As I have said many times, to lose a loved one or a family member is a horrific event. Last night, we lost not only an officer but a great man, a dedicated servant to our community and a family member,” said Police Director Toney Armstrong during a press conference, according to WMC.

Police said earlier Sunday a manhunt was underway for a suspect. Memphis City Council and U.S. Marshals have each offered a $10,000 reward for Wilbourn. Bolton is the third Memphis police officer to be killed in a little more than four years, the Associated Press reported. Officer Tim Warren was killed while responding to a shooting at a hotel in 2011, and Officer Martoiya Lang was killed while serving a warrant in December 2012.

Memphis Mayor A.C. Wharton Jr. said Bolton's death, "speaks volumes about the inherent danger of police work" and asked the city to pray for his family and Memphis as a whole, according to the Associated Press.