This undated photo provided by PsychArmor Institute shows clinical psychologist Jennifer Gonzales, a victim of the veterans home shooting on Friday, March 9, 2018, in Yountville, Calif. Gonzales was killed by a former patient at Pathway Home, a treatment program for veterans from the wars in Afghanistan and Iraq. Marjorie Morrison, the founder of a nonprofit organization known as PsychArmor, says Gonzales was "brilliant" and did amazing work with veterans with PTSD. (PsychArmor Institute via AP)

YOUNTVILLE, Calif. - Authorities in Northern California have so far been tight-lipped about why a former Army rifleman may have killed three women after a daylong siege at a veterans home in Napa County wine country.

Albert Wong, 36, slipped into a going-away party for two employees of The Pathway Home on the campus of the Yountville veterans home campus about 50 miles (85 kilometres) north of San Francisco on Friday, then let some people leave, but kept the three women.

Wong, whose military records show he served in Afghanistan from April 2011 to March 2012, was enrolled in The Pathway Home's veteran treatment program until he was recently expelled, according to a relative of one of the women.

Law enforcement officials did not respond to questions throughout the weekend about what led to Wong being dismissed from the program or whether officials had alerted police or others to any concerns about his mental health after he was removed from the program. Records also show a state-issued security permit Wong had for a 9mm firearm was cancelled in October, but state officials could not immediately say why.

Executive Director Christine Loeber, 48; Clinical Director Jennifer Golick, 42; and Jennifer Gonzales Shushereba, 32, a clinical psychologist with the San Francisco Department of Veterans Affairs Healthcare System were remembered as immensely talented women who cared deeply about veterans suffering from post-traumatic stress.

Gonzales Shushereba was seven months pregnant. She was married a year ago and was supposed to travel to Washington, D.C., with her husband this weekend to celebrate their anniversary.

"Jennifer and her colleagues died doing the work they were so passionate about — helping those in critical need," her husband, T.J. Shushereba said in a statement.

Directors of the veterans program are beginning an exhaustive review of security protocols, said The Pathway Home spokesman Larry Kamer. It may never reopen, he said.

The six residents have been moved to other facilities while officials discuss the future of the program, Kamer tells the San Francisco Chronicle.

The facility's board members are scrutinizing building security, emergency protocols and what kind of screenings are in place for incoming patients.

Cissy Sherr, of Milbrae, said in an interview with The Associated Press that she and her husband became Wong's guardians after his father died and his mother developed health problems. When Wong became a teenager and Sherr and her husband worked full-time, they decided to put him in foster care.

"He always had a great smile on his face," she said. "He didn't have a traditional upbringing but still he just became a fine young man. I can't imagine what happened. It doesn't make any sense to me."

News from © The Associated Press, 2018