Lexington police have a sketch they feel confident will help find the suspect.
Police say a woman walking in the area of Main Street and Newtown Pike was approached by a man who she believes to be homeless.
The victim told police she had seen the man before.
Police say the man put her in a choke-hold, then hit her over the head.
The suspect dragged the victim behind a dumpster, according to police, then sexually assaulted her.
Police are hoping the composite sketch will help catch the suspect.