BATON ROUGE - Police say a lack of evidence has prevented them from making much headway after a woman was gunned down for no discernible reason earlier this year. 

The Baton Rouge Police Department says they're looking for one man in the murder of Nessa Hartley. 

Hartley was shot in mid-January while dropping off her friend in a usually quiet neighborhood on Brookshire Avenue. Hartley and her friend were returning from a birthday celebration earlier that night. 

With little evidence to go on, investigators have been unable to identify any possible suspects or come up with a detailed description for those responsible. The evidence they do have includes some inconclusive DNA from Hartley's car door and some nearby surveillance video. 

Originally, police said in an update this week, they were looking for two suspects. But, later, detectives said they had erred and were only focusing on the possibility of one suspect in the case.

While the investigation is ongoing, BRPD says it has exhausted all leads for the time being.