This photo provided by the Stockton Police Department shows a gun found in the possession of Wesley Brownlee, who was arrested Saturday, Oct. 15, 2022, in connection to a series of shootings. An official says that Brownlee, charged with fatally shooting three men who police said were among six victims slain by a serial killer in Northern California used a so-called ghost gun, a firearm without a serial number.(Stockton Police Department via AP)

This booking photo provided by the Stockton Police Department shows Wesley Brownlee, from Stockton, Calif., who was arrested Saturday, Oct. 15, 2022, in connection to a series of shootings. Brownlee, suspected of killing six men and wounding a woman in Northern California was arrested before dawn Saturday as he was apparently searching for another victim, police said. (Stockton Police Department via AP)

Stockton Police Chief Stanley McFadden, right, flanked by Stockton Mayor Kevin Lincoln, left, updates reporters about the investigation into the fatal shooting of six men and the wounding of one woman dating back to last year, during a news conference in Stockton, Calif., Tuesday, Oct. 4, 2022. (AP Photo/Rich Pedroncelli)

Stockton Police Chief Stanley McFadden, left, flanked by Stockton City Manager Harry Black, right, updates reporters about the investigation into the fatal shooting of six men and the wounding of one woman dating back to last year, during a news conference in Stockton, Calif., Tuesday, Oct. 4, 2022. (AP Photo/Rich Pedroncelli)

Stockton Police Chief Stanley McFadden updates reporters about the investigation into the fatal shooting of six men and the wounding of one woman dating back to last year, during a news conference in Stockton, Calif., Tuesday, Oct. 4, 2022. (AP Photo/Rich Pedroncelli)

Stockton Police Chief Stanley McFadden, right, flanked by Stockton Mayor Kevin Lincoln, left, updates reporters about the investigation into the fatal shooting of six men and the wounding of one woman dating back to last year, during a news conference in Stockton, Calif., Tuesday, Oct. 4, 2022. (AP Photo/Rich Pedroncelli)

Stockton Police show a a brief video from a surveillance camera of an image of what authorities describe as a "person of interest," in the investigation into a suspected serial killer during a news conference in Stockton, Calif., Tuesday, Oct. 4, 2022. Ballistics tests have linked the fatal shootings of six men and the wounding of one woman in California — all potentially at the hands of a serial killer — in crimes going back more than a year, police said. (AP Photo/Rich Pedroncelli)

Stockton Police Chief Stanley McFadden, center, flanked by Stockton Mayor Kevin Lincoln, left, and City Manager Harry Black listen to a question about the investigation into a suspected serial killer during a news conference in Stockton, Calif., Tuesday, Oct. 4, 2022. Ballistics tests have linked the fatal shootings of six men and the wounding of one woman in California — all potentially at the hands of a serial killer — in crimes going back more than a year, police said. (AP Photo/Rich Pedroncelli)

Stockton Mayor Kevin Lincoln, left, flanked by Stockton City Manager Harry Black, right, updates reporters about the investigation into a suspected serial killer during a news conference in Stockton, Calif., Tuesday, Oct. 4, 2022. (AP Photo/Rich Pedroncelli)

Stockton Police Public Information Officer Joseph Silva stands next to an enlarged image of what authorities describe as a "person on interest," in the investigation into a suspected serial killer during a news conference in Stockton , Calif., Tuesday, Oct. 4, 2022. Ballistics tests have linked the fatal shootings of six men and the wounding of one woman in California — all potentially at the hands of a serial killer — in crimes going back more than a year, police said. (AP Photo/Rich Pedroncelli)