The incident occurred around 3:35 p.m. Saturday on a trail along North Park Drive in Brandywine Park.
Investigators say the 55-year-old victim was jogging through the park when she came upon the suspect, who was standing on the trail. The victim told police that the man exposed his genitals as she ran by him.
The victim managed to take a photograph of the suspect and then contacted police as the suspect fled.
He is described as a white male, early 30's, black curly hair, last seen wearing a blue sweatshirt, dark running shorts with white and blue stripes, bright blue running shoes.
Investigators believe this is the same man who exposed himself in several incident in the park last summer.
Anyone who recognizes the suspect should contact the Wilmington Police at 302-576-3646. You can also contact the Wilmington Police Confidential Tip Line at 302-576-3990 or dial Crime Stoppers at 1-800-TIP-3333.