The gun-wiedling man demanded a woman's phone and jewelry while she was walking on the trails behind the Wilmington Family Medical Center around 5:30 p.m. on July 6, police said.
The suspect is described as a man in his mid-40s, standing about 5'8," and weighing about 180 pounds. He was last seen wearing a blue surgical mask, dark blue t-shirt and dark brown pants, according to police.
The suspect also was said to have blue eyes, messy dirty blonde hair and some type of unkempt facial hair, according to police. Police warn the sketch of the suspect makes him look younger.
Anyone with information is asked to contact police at 978-658-5071.
Click here to follow Daily Voice Cambridge and receive free news updates.