When he began to sexually assault her, she struggled with him, trying to get his gun.
He kept control of the weapon, and demanded cash from her.
After he received the money, he fled.
The suspect is described as a black man between 30 and 35 years old, 6 feet 2 inches, 220-240 pounds, with a mustache.
He was last seen wearing a black and white baseball cap, a white T-shirt with a black long sleeve shirt underneath, black jeans, and black and white high top tennis shoes.