Shortly after a woman was fatally shot in a residence near Union Square and the Westfield Mall, police detained a man they described as "a person of interest." Thursday afternoon, the San Francisco Police Department announced that after a lengthy period of questioning, the suspect had been arrested, and faces numerous charges in the death.

As previously reported, police were called to the 100 block of Mason Street, which is between Eddy and Ellis Streets, on reports that a woman had been shot and killed.

The victim, identified by Bay City News as 51-year-old Barbara Pomposo, was found shot in the torso. She died at the scene, which the Ex reports was a room inside 149 Mason Street, a "supportive housing community targeting very low income San Francisco residents who are homeless or at risk for homelessness and have special needs," according to the development's website.

(Though it's been reported elsewhere that the building is an SRO, that does not appear to be the case, as according to its website it consists of "fifty six studio homes each with its own private bathroom and kitchenette...located just two blocks from BART, Westfield Shopping Center and other cultural activities.")

BCN reports that "Pomposo had no confirmed residence at the time of her death." It's unclear if she was staying at 149 Mason, or if she was just visiting when she was shot.

According to SFPD spokesperson Officer Grace Gatpandan, "from evidence gathered at the crime scene, officers were able to identify a possible person of interest in the case and a description was given to responding officers." By 9:47 p.m. Tuesday, that suspect was found: 62-year-old San Francisco resident Antonio Crivello, who was detained by police near Leavenworth and Ellis Streets.

When I spoke to Gatpandan 12 hours later, Crivello was still being questioned by holicide investigators, and had yet to be named or arrested, she said at the time.

By Thursday afternoon, however, Crivello had been booked into San Francisco County Jail for Pomposo's murder, for being a felon in possession of a firearm, and for two outstanding traffic warrants.

As always, though an arrest has been made, Gatpandan urges anyone with further information on the case to contact SFPD's Anonymous Tip Line at (415) 575-4444 o rto text-a-tip to TIP411 with SFPD at the beginning of the message.

Previously: SF's 39th Homicide For 2015: Woman Killed Near Westfield Mall