Lewis Williams, aged 20, was gunned down on Wath Road, Mexborough, at around 5pm yesterday.
A 17-year-old boy is being held on suspicion of murder after being arrested in the early hours of this morning.
Here is everything known about the killing so far.
1. MURDER
Lewis Williams, aged 20, was shot dead outside the Farmfoods store on Wath Road, Mexborough, at around 5pm yesterday. Despite the efforts of paramedics he was pronounced dead at the scene. Photo: JPI Media
2. TRIBUTES
Tributes have been paid to Lewis online, with his brother, Jason Williams, posting: "Best thing in world he was, honestly the proudest brother of all time I was.” Photo: Facebook
3. CORDON
A cordon was put in place around the crime scene after the shooting and it remains under police guard today as detectives attempt to piece together exactly what happened and who was involved. Photo: Marie Caley
4. FORENSICS
A tent has been erected at the spot where Lewis was shot dead in an attempt to preserve any forensic evidence at the scene to help detectives investigating the murder. Photo: Marie Caley