Police began arriving at the scene within minutes, and entered Urology Nevada while some callers still were on the phone.
Police confirmed Tuesday Frazier had been a patient at the facility, and complained about a botched surgery in 2010.
The unemployed former power plant worker made it clear in a suicide note that he planned the attack and that his focus was on the physicians at Urology Nevada, police said. Authorities have not said who operated on Frazier, who lived near Lake Almanor, about 130 miles north of Reno.
Detectives are “actively looking into” Frazier’s involvement in an Internet chat room where he reportedly complained about complications from the surgery, city spokeswoman Sharon Spangler said.
She confirmed investigators are interviewing a former fiancee of Frazier’s who told The Associated Press he took medication for depression when they were together in the mid-1990s. They’re also talking to a neighbor who said Frazier told him the day of the shooting that he was leaving and not coming back.
Police haven’t determined if Frazier had a history of mental illness. But Spangler said detectives are in contact with the ex-fiancee, who told the AP he was a different person when he didn’t take his medication for depression and was suicidal at least once during the 18 months they were together.
Spangler also acknowledged investigators talked to the neighbor, Mike Hawthorne, who told the Reno Gazette-Journal that Frazier said the day of the shooting he wouldn’t be back.
Citing a neighbor, the Gazette-Journal first reported that Frazier sometimes ranted in a Yahoo group about vasectomy pain that he was still suffering more than two years after what he claimed was a botched surgery.
Witnesses told investigators that Frazier said during the attack that he was looking for physicians. He used the shotgun to kill Dr. Charles G. Gholdoian, 46, president of Urology Nevada. He also critically wounded Dr. Christine Lajeunesse and seriously injured Shantae Spears, who was accompanying a relative on an office visit. Frazier then turned the gun on himself.