Jasheem Smiley of Williamsburg says he was on a southbound 4 train early Sunday morning when he saw a man sit down next to a sleeping woman and sexually assault her in full view of other riders.

Shameless Predator Caught on Camera Molesting Sleeping Subway Rider

"This guy gets on at 96th Street, and the look on his face was just so suspicious," Smiley told Gothamist. "He gave her a look like he knew her or something, and I turned the music off in my headphones to hear what was going on. When he started touching, her that's when I turned my camera on. My jaw dropped. I had never seen anything like this before."

After capturing a few seconds of the assault on camera, Smiley and a fellow passenger tried to put an end it by yelling at the man and alerting the victim, but to no avail. It wasn't until the man tried to pull the woman closer that she finally awoke and ended his assault by punching him hard in the cheek.

According to Smiley, the woman, who did not appear to be under the influence, got up and exited the train at the following station.

After Smiley showed the footage he recorded to the conductor, she promptly stopped the train, but the man had already made his escape by then.

An MTA detective is reportedly investigating the incident.

[video via Gothamist]