A man caught on surveillance cameras has been charged with sexually assaulting a woman as she walked home through a Lakeview alley, according to police.

Marcus Lynch, 20, of the 4700 block of South Loomis Boulevard, has been charged with one count of aggravated criminal sexual assault with a weapon and one count of armed robbery, police said.

Surveillance cameras showed Lynch following the woman to a gas station at Halsted Street and Addison Avenue, where she bought cigarettes, and then following her down an alley as she headed home Monday afternoon, according to a police report.

A camera on the CTA Red Line captured Lynch fleeing after the attack, police said. Fingerprints recovered from the scene matched his, according to the police report.

The 22-year-old woman told police she was walking through the alley in the 3500 block of North Halsted Street around 4:25 p.m. Monday when she heard someone running and turned to see a man headed toward her, the report said.

The woman thought the man would run past her, but instead he grabbed her around the neck, pulled out a knife and said, “Don’t do anything, I’ll slit your throat,” according to police. He forced her to the back of a garage and assaulted her behind a pickup truck, police said.

The man then pushed her to the ground and ran off with her purse and iPhone, warning her, “I know where you live.” The woman waited a few minutes, then ran to a nearby coffee shop for help. She was taken to Advocate Illinois Masonic Hospital, according to a police report.

Police described the suspect as black, between the ages of 25 and 32, 5-foot-4 to 5-foot-5, police said. He was wearing a black skull cap, blue jeans and white gym shoes, according to police.

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