OAKLAND, Calif. _ Police have recovered the gun they believe was used by a disgruntled former nursing student who went on a killing spree at a small private Christian university in East Oakland, authorities said.

The .45 caliber semi-automatic pistol was found Friday morning in a marshy tributary exposed by low tide. The spot is not on the stretch of the Oakland Estuary that police had been searching since Tuesday.

Officers were alerted to the new location after a passer-by found a gun magazine Thursday night, authorities said. The weapon, was found nearby along the shoreline Friday morning.

Police said the serial number on the weapon found matched the purchase records of the gun One L. Goh bought from a Castro Valley gun shop six weeks ago.

"Investigators have worked very hard on this case. Hopefully, this find will help the families find closure and bring this case to justice," Police Chief Howard Jordan said in a statement.

Meanwhile, sources confirm that Wonja Kim, a Danville, Calif., resident, was the former Oikos University administrator targeted by the 43-year-old Goh. Ellen Cervellon, the school's nursing director, had previously said she believed she was the person Goh sought.

Police said they were investigating the possibility that the gunman had multiple targets that he intended to kill in his rampage.

Kim, an assistant nursing director at Oikos before she left late last year, declined to comment when reached by phone by a Bay Area News Group reporter.

Officials said Kim was one of the administrators dealing with Goh when he tried numerous times to get back tuition after he left the vocational school in November. Goh got angry when told the school could not refund all his money because he had been enrolled for nearly half of the program.

Police initially were told Goh had been expelled from the school but officials later said he had actually left voluntarily.

Police have said Goh was seeking Kim when he went to the campus Monday morning. He entered the administrative office looking for her, not knowing Kim had left the school. The only person in the office was receptionist Katleen Ping. He forcibly herded her down the hallway into a classroom filled with some of his former classmates.

He pulled out a gun and ordered the students to line up against the wall, sparking a scramble, followed by him opening fire. He reloaded at least once, and prosecutors say he brought at least four magazines with him.

Afterward, he fled in a victim's car to Alameda, where he surrendered to police.

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By the end of the melee, the dead included Ping, 24, of Oakland; Judith O. Seymour, 53, of San Jose; Lydia H. Sim, 21, of Hayward; Sonam Choedon, 33, of El Cerrito; Grace Kim, 23, of Union City; Doris Chibuko, 40, of San Leandro; and Tshering Rinzing Bhutia, 38, of San Francisco.

Three other students were injured but have since been released from the hospital.

Goh was charged Wednesday with seven counts of murder, three counts of attempted murder and a host of other felonies that will make him eligible for the death penalty.