The detectives for the Abbeville Police Department arrested the 16-year-old male around 2 p.m. on Thursday.
The juvenile is a relative of Plowden, who will be buried Saturday at 1 p.m.
Police believe the juvenile fired the .45-caliber pistol that killed Plowden. On Thursday, the juvenile was at the St. James Correctional Facility.
Abbeville Police Chief Rick Coleman praises his department and the residents of Abbeville for helping find the possible killer just four days after the homicide occurred.
“I am pleased with how the community cooperated, which speaks well for the citizens,” Coleman said. “That shows they wanted this person off the street.
“That also speaks highly of our police department.”
Coleman said the detectives are still working on the case and he expects more arrests will be made in the future. He was not willing to say if the juvenile has a criminal record or why he fired at Plowden’s vehicle five times with a .45-caliber pistol.
One of the bullets struck Plowden in the back of the neck as he drove off, causing him to wreck.
The homicide was the first in Abbeville in 18 months.