Twenty-one-year-old Starlet Hewlett of Wilmington was arrested on Thursday. She is charged with assault, robbery and other offenses. She is being held on $77,000 secured bail.
Troopers say three people entered a Wawa in Wilmington on Tuesday and went into the bathroom. Two people ran from the store with a man giving chase.
Police say the man returned to the store, and collapsed from a stab wound to the back.
Troopers have also obtained warrants charging 27-year-old Ryan West of Newark with robbery in the case.