Georgia deadly purse snatchers on the run

COVINGTON, Ga. (WPVI) -- Police are working to track down a couple accused of robbing and running over a grandmother at a Georgia Walmart.

Security video clearly shows a man violently snatching Marsha Johnson's purse in Covington.

He then jumps into a car with another woman and runs over Johnson more than four times, killing her.

Police were able to release a sketch of the suspect and the woman who was with him.

They also found the victim's credit card in Chattanooga, Tennessee.