The victim, identified by the medical examiner's office as 71-year-old Sutchi Hui, was struck at the intersection of Market and Castro streets shortly before 8:10 a.m. on March 29, police said.
Authorities were not immediately releasing the location or time of Hui's death, and the cause of death remains under investigation.
Police said the accident happened when a man riding a bicycle was traveling south on Castro Street and was crossing Market Street when he struck Hui, who was walking east in the crosswalk.
Witnesses reported that the bicyclist, who has not been identified, may have run a red light prior to the collision, but that information has not yet been confirmed.
District attorney's spokesman Omid Talai said, "The case has not been formally presented to us but we are consulting with the SFPD."