After the shooting, investigators shared surveillance images of the suspect but said there were no known witnesses.
Abdulkadir was arrested in Lithonia and booked into the Gwinnett jail, where he remained Thursday, held without bond. Investigators have not released a motive.
Hundreds packed the sanctuary of Lawrenceville’s North Metro Baptist Church for Riner’s funeral.
“The irony of it is, the young man who took his life would be the very kind of young man that Scott would try to help,” Pastor Frank Cox said during the service.
Riner was a married grandfather and father of two.
“A hundred years from now,” Riner once wrote on Facebook, “it won’t matter what my bank account was, the sort of house I lived in or the kind of truck I drove. But the world will be a better place because I was important in the lives of my two kids.”