Last Updated Dec 18, 2013 9:10 PM EST
Investigators said they had tentatively identified the gunman, who fired five shots with a shotgun inside the Center for Advanced Medicine at Renown Regional Medical Center on Tuesday afternoon before turning the gun on himself.
The gunman was a longtime resident of Plumas County, Calif., CBS affiliate KTVN reported. Plumas County Sheriff Greg Hagwood said authorities were still trying to locate the man's relatives.
Also on Wednesday, officials identified the victims of the shooting. Dr. Charles G. Gholdoian, a 46-year-old urologist, was
killed and one of his partners, Dr. Christine Lajeunesse, was wounded. Lejeunesse was in critical condition Wednesday but was conscious and communicating, Renown Medical Center spokeswoman Angela Rambo said.
Shawntae Spears, 20, who was accompanying a family member to a doctor's appointment, was also wounded, officials said.
Authorities said they had not been able to establish any connection between the gunman and any of the victims. But Reno Deputy Police Chief Mac Venzo said the shooter's actions indicated his attack was "not a random event."
"The shooter went through the first and second floor, made his way to the third floor of the building, would indicate to me it is not a random event," Venzo told reporters.
"While we piece this thing together, we are trying to figure out what that relationship is, if there is a relationship at all," he said.Gholdoian was married and had two children.
"He wasn't your typical doctor," Lita Scott, whose father was treated by Gholdoian, told the Reno Gazette-Journal. "He was one of those few doctors who would look you in the eye when he talked to you. He was such a kind guy."