Matthew Schuman remains in critical but stable condition in hospital after the shooting early Friday morning, his wife Jennifer said in a statement released Tuesday.
"I was in absolute shock when I received the phone call at 1 a.m. that Matthew was involved in an accident. My focus was on getting to the hospital and being by his side," said Jennifer, who has a different last name than her husband and does not want it published.
"Sunday evening was the first time that he opened his eyes and squeezed my hand. Shortly thereafter he went back to sleep. We remain cautiously optimistic that his condition will improve."
Schuman was one of five G4S security guards loading a bank machine at the University of Alberta when shots rang out.
Four guards were shot. Eddie Rejano, 39, Michelle Shegelski, 26, and Brian Ilesic, 35, died.
Police have said the fifth guard was Travis Baumgartner. The 21-year-old was arrested at a U.S. border crossing near Abbotsford, B.C., on the weekend. Police say he was carrying $330,000 in a backpack.
"I was very relieved to hear that (he) ... was captured and I was pleased that he was alive in hopes that he co-operates and explains his actions, because he has affected so many lives," Jennifer said.
"His actions have angered an entire country, and I hope that at one point he can comprehend the level of damage he has done."
Baumgartner is to be returned to Edmonton this week where he is expected to be formally charged with three counts of first-degree murder and one count of attempted murder. None of the charges has been proven in court.
Working for G4S was Schuman's civilian job. He also is a corporal in the military.
"I can't begin to fathom the grief the families of the other victims must be experiencing. My heart goes out to them and I hope that they have some small solace in knowing that the attacker is behind bars," his wife said.
"I'm touched at the level of concern and gentle inquiries about Matthew's condition. I'm very thankful for the public support and generosity."
Note to readers: This is a corrected story. An earlier version identified the wife as Jennifer Schuman, but the military advises she has a different last name, which she does not want published.