SAN FRANCISCO (CBS SF) -- San Francisco Police requested the public's help Tuesday searching for a gunman who shot and killed a 61-year-old man early that morning.

The investigation began around 3:26 a.m. Tuesday, when officers received reports of a shooting on the 300 block of Golden Gate Avenue. According to reports, a unknown gunman fired into a business from the street before fleeing the scene.

Responding officers arrived to find the victim suffering from gunshot wounds. First responders took the victim to a hospital, where he died of his injuries.

Officers located a second victim around the same time -- a 31-year-old woman who was injured by broken glass.

This investigation is being led by the SFPD Homicide Detail.

Anyone with information was asked to call the SFPD Tip Line at 1-415-575-4444 or Text a Tip to TIP411 and begin the text message with SFPD. You may remain anonymous.