Michael Schaab, of Edgewood, was killed when a lone gunman opened fire in the hospital's lobby.
Investigators said the gunman, who has yet to be identified, used two semi-automatic weapons in the attack.
Channel 11's Courtney Brennan spoke to Schaab's neighbor who said he recently proposed to his girlfriend on Valentine's Day and was set to celebrate his 26th birthday on Saint Patrick's Day.
Schaab's family members said they were talking to him on the phone when the connection suddenly got cut off, but they didn't think anything of it. They tried to get him back on the phone, but never did.
They said Schaab was a therapist who worked on the upper floors so they did not think he would have been near the shooting scene in the lobby.
Family members said Schaab may have been attempting to leave or walking through the area of the lobby when the gunman entered.
“I guess he was just in the wrong place at the wrong time,” Schaab’s neighbor Donna Slavnik said. “It’s just so sad for a 25-year-old to die like this. It’s just horrible.”
Schaab's neighbor said he originally wanted to be an accountant but then changed his mind because he wanted to help people. She said Schaab loved his job and has won several awards for his work.
“He was my Godson,” Joe Daum said about his nephew. “He was a beautiful boy, a beautiful man.”
Daum said he was most proud of Schaab for becoming a therapist simply because he wanted to help people.
"We are deeply saddened by the tragic loss of our colleague and friend, Michael Schaab, yesterday. It was clear that Michael was truly a leader among our staff, and he was beloved by the geriatric patients whom he cared for every day. Our thoughts and prayers are with his family and friends during this time. This senseless act of violence has had a profound impact on all of us who knew and admired him. He will be greatly missed," said president and CEO of Western Psychiatric Dr. Claudia Roth.
Schaab’s fiancé, whom he proposed to on Valentine’s Day, is a nurse at UPMC Presbyterian Hospital and was in the trauma unit Thursday when the shooting victims came in. She has not yet commented on the incident.
Schaab's mother, Mary, said her only other child, Nancy Schaab, was slain at age 26 during a domestic dispute in October 2010.