Schaab, of suburban Edgewood, had worked at the clinic since graduating from Pitt with a psychology degree and was going back to school to get his master's degree in occupational therapy. He had one sibling, a 26-year-old sister, who was shot to death during a domestic dispute in 2010; her live-in boyfriend is in prison for voluntary manslaughter.
Schaabhad recently gotten engaged, his mother said.
"We were just planning his wedding," Mary Schaab of Greensburg, Pennsylvania, said, sobbing. "March 2013."
Schaab said she had not been especially worried as she watched the television news coverage that day about a gunman who killed one person and shot several others at the Pittsburgh psychiatric hospital where her son worked.
"We sat and watched the news for hours and not even thinking (he might be a victim) because he worked on another floor, an upper floor," Mary Schaab said, referring to news accounts of the shooting on the first floor lobby of the clinic.
Police now believe Michael Schaab was returning from a lunch break and just happened to be in the lobby when Shick opened fire.
"A trooper came by and told us, about 10 or 11 last night," the Greensburg mother said Friday.