Sarnia police are investigating a second unprovoked, random assault in the city over the past month.
Police said a 57-year-old woman was walking her dogs in the area of Napier Street and Durand Street on March 30.
While cleaning up after her dog, she was allegedly struck from behind in the face, twice, with a closed fist.
She was unable to give an accurate description of the suspect.
Police said the victim suffered bruising and headaches.
Anyone who has information, or video footage, is asked to call Det. Cst. Shawn Munro at (519) 344-8861 x 6179.
You can also call Sarnia-Lambton Crime Stoppers at 519-332-TIPS (8477) or visit www.p3tips.com.
A 16-year-old suspect was previously arrested in connection to an unprovoked assault on Talfourd Street on Sunday, March 10.