Almost three weeks after a woman was randomly attacked during a mid-morning walk near Union Square, the San Francisco Police Department is no nearer to finding her assailant, and hopes you can help.

According to SFPD spokesperson Officer Albie Esparza, a 38-year-old woman was walking near the intersection of Grant Avenue and Geary Street at 11:05 a.m. on Saturday, May 9.

"The suspect, for no reason, called the victim a derogatory name and attacked the victim by punching her in the face and knocking her to the ground," Esparza says.

The woman received a serious injury to her face, Esparza says, and continues to need treatment to this day.

The suspect fled on foot, and has not been seen since. He's described as a 5'6" tall white male, with brown hair. He was wearing a brown hooded sweatshirt, dark jeans and dirty shoes at the time of the attack.

Though the assault went down in an area in which you might assume there would be cameras, "to date, video evidence in the case has not panned out," Esparza says. They best they can do is the suspect sketch you see above.

Does that drawing ring any bells? Know anything else about this strange and random attack? Esparza asks that anyone with information on this incident contact SFPD at 415-575-4444 or text-a-tip to TIP411 with SFPD at the start of the message.