A week after a woman received traumatic brain injuries during an altercation that began on a Muni bus, that woman has died in what police say is San Francisco's 40th homicide for 2015.

The 55-year-old woman, identified by Bay City News as Nancy Tynan of San Francisco, got into an argument with a man and woman on the 9-San Bruno at around 7 p.m. on Thursday, October 15.

The trio got off the bus at Potrero Avenue and 16th Street, where the dispute continued. Witnesses in the area told police that they heard yelling, and that after that they saw the woman, unconscious, on the ground.

The woman was transported to San Francisco General Hospital with what police described as a life-threatening brain injury, and remained on life-support until "just before midnight Friday" October 23, when that support was removed, the Ex reports.

The two suspects fled the scene on foot, police said at the time. They remain at large as of Monday afternoon. The investigation, which began as that into a battery, has been handed to the San Francisco Police Department's homicide unit.

According to an SFPD spokesperson, this is San Francisco's the 40th case of homicide for 2015. As always, police urge anyone who might have information on the case to contact their anonymous tip line at 415-575-4444 or to text them a tip to TIP411 with "SFPD" in the beginning of the message.

Previously: Woman Suffers Life-Threatening Injury After Argument On Muni Bus Turns Ugly