A San Francisco jury has convicted Lisa R. Gonzales of second‑degree murder for killing her roommate in 2018 and then dismembering the body, a brutal crime that started coming to light when human remains were found beneath a Mission District apartment.
Verdict And Weapon Finding
As announced by the San Francisco District Attorney's Office, a jury found Gonzales guilty of second‑degree murder and returned a separate true finding that she personally used a deadly weapon, which prosecutors identified as a knife. The DA’s post states that Gonzales killed her roommate in 2018, then dismembered the body in an effort to hide the crime. The case was tried before a jury in the San Francisco Superior Court this year.
2/ Ms. Gonzales was convicted of second-degree murder w/ an allegation that she personally used a deadly weapon (a knife) in the commission of the murder found true. After Ms. Gonzales killed the victim, she proceeded to dismember her to conceal what she had just done.
— SF DISTRICT ATTORNEY (@SFDAOffice) April 1, 2026
How The Killing Unfolded
Police were first called in June 2018 after a missing‑person report led officers to a storage area beneath an apartment on 14th Street. There, they discovered decomposing remains in a plastic tub. According to SFGATE, officers recovered severed arms and legs, and neighbors reported foul odors and saw‑like noises coming from the building in mid‑May of that year. Authorities later identified the victim as Margaret (Maggie) Mamer and arrested Gonzales at the scene.
Autopsy Findings And Trial Evidence
The San Francisco Medical Examiner’s autopsy documented multiple sharp‑force and blunt‑force injuries, along with cut marks consistent with sawing and attempts to separate the torso, according to Mission Local. Examiners found sharp‑force wounds to the head and neck and evidence that portions of the limbs and torso had been sawed apart. Prosecutors leaned heavily on those forensic details at trial, using them to support their account of the killing and of steps taken afterward to conceal the body.
What California Law Allows
Under California law, second‑degree murder carries a potential sentence of 15 years to life in state prison. A jury’s true finding that a defendant personally used a deadly weapon can trigger an additional sentencing enhancement. As outlined in California Penal Code §190 and the state’s sentencing rules, a personal‑use finding for a deadly or dangerous weapon can add a consecutive term under Penal Code §12022.
Sentencing Still To Come
The District Attorney’s announcement did not list a sentencing date. The court is expected to schedule a hearing where prosecutors and defense counsel can argue over punishment and present any post‑trial motions. Upcoming court filings will show when sentencing is set and whether the defense moves to challenge the verdict or the weapon enhancement.
Mission District Still Haunted By The Case
Back in 2018, neighbors told reporters that the 200 block of 14th Street felt like a typical Mission District block despite what had happened behind closed doors. Mission Local noted that the decomposing remains were ultimately recovered from a storage locker at 255 14th Street. Years later, the case continues to loom large in neighborhood memory as a grim example of domestic conflict and housing instability playing out in one of San Francisco’s most densely packed corners.
