Charles Faison, 39, was found shot to death around 12:20 p.m. on June 20, shortly after police received a 911 call for an ambulance in the 2000 block of Emerson Street.
Detectives canvassed the neighborhood and interviewed family members but police are not revealing details about the shooting because they do not want to compromise the case.
Bay Area Crime Stoppers is offering an additional $2,000 reward for information leading to a conviction.
Anyone with information on the murder is asked to call the Berkeley Police Department Homicide Detail at (510) 981-5741 or (510) 981-5900.
Anonymous callers can dial the Bay Area Crime Stoppers Tip Line at (800) 222-TIPS, or (800) 222-8477.