The San Francisco Police Department is asking city residents to be on the lookout for a "habitual shoplifter" whose heists recently turned violent, a spokesperson said Wednesday.

According to SFPD spokesperson Officer Carlos Manfredi, it was 10:45 a.m. on December 18 when the man you'll see in the video below rode his bike up to a business he described as "on the 2011 block of Chestnut Street."

As the Walgreens logo is clearly visible in the video, it stands to reason that the business in question is the Walgreens at 2141 Chestnut Street, between Steiner and Pierce Streets.

According to Manfredi, the man "entered the store, walked directly to the make-up aisle, and began putting various cosmetic items inside his jacket pocket."

Employees, recognizing the man as someone who'd swiped items before, told him to put the make-up down and to beat it. He ignored them, and after he'd "stuffed his jacket full of stolen property," Manfredi says, "he then proceeded to the exit door and began shoving and pushing the employees out of his way."

According to Manfredi, another Walgreens staffer even tried to stop him outside the store, but the thief "brandished a knife and yelled threats," at which point the staffer released him.

The shoplifter fled west on Chestnut, and hasn't been seen since.

Manfredi asks that if you recognize the guy, or see him around, that you contact SFPD's anonymous tip line at 415-575-4444, or text them a tip at TIP411, just remember to begin the message with "SFPD."