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On Oct. 5, 2022, the Shelbyville Police Department responded to a residence where they located Mayes dead from a gunshot wound caused by a 9mm bullet. SPD found multiple 9mm shell casings, but the handgun that fired those rounds was not found at the scene.

Nearly a year later, in July 2023, Lebanon Police conducted a traffic stop on a white Nissan Altima in a Lebanon neighborhood for a non-functioning passenger-side headlight. The driver was identified as Parrish, who notified officers that he had a firearm in the vehicle.

LPD officers searched the vehicle, finding two handguns — a Glock 19 chambered in 9mm and a Smith & Wesson chambered in .40 S&W. According to police, the Glock had markings “consistent with gang-related defacement.� Authorities did not elaborate on the defacing.

Parrish was arrested on multiple charges from weapons offenses to drug possession and booked into the Wilson County Jail. LPD detectives submitted ballistics information from both handguns to the Bureau of Alcohol, Tobacco, Firearms and Explosives’ (ATF) National Integrated Ballistic Information Network (NIBIN). Each handgun leaves unique markings on bullets and casings it fires.

Law enforcement agencies use the NIBIN database to search if recovered firearms or spent cartridges have been indexed in other jurisdictions. Eventually, the Tennessee Bureau of Investigation matched the Glock 19 recovered from Parrish to the ballistics found at the 2022 Shelbyville murder scene.

Parrish was arrested by Shelbyville Police with assistance from the U.S. Marshals Service in June 2024. An LPD Officer assisted the 17th Judicial District Attorney General’s Office by testifying during prosecution during the November 2025 trial. Sentencing for Parrish is scheduled for January 2026.

“We are grateful for the hard work of our officers and detectives, and proud of the strong partnerships we maintain with other agencies. Working together makes justice like this possible,� LPD said in a press release.