Authorities are hoping the sketch will help them track down the suspect.
The victim, whose name was withheld, had just left a bar near the area of Colorado Boulevard and Holly Street when the suspect approached her from behind and forced her to Legge Alley. He then sexually assault her and fled the alley on foot.
The suspect was described as a Hispanic male, between 30-40 years old, about 5 feet 6 inches to 5 feet 9 inches tall, with a medium build. He has a thin mustache and goatee, and possibly a flat mole or dark mark on his cheek.
Anyone with any information on the assault was urged to contact Det. Sandeen at (626) 744-7099.