An alert bystander helped police catch a purse snatcher on Wednesday morning. According to police, the victim was leaving a store near Winco on Sheldon road, shortly before 11 am, when the suspect, a 15 year old black male, attempted to take her purse. After a brief struggle, the suspect was able to take the purse from the victim and attempted to flee on foot. A bystander witnessing the incident chased after the suspect and caught him. He was able to detain the suspect until officers arrived. The teen also had an active warrants out for his arrest. He was taken into custody and transported to juvenile hall.