Bush, 59, was arrested in December after Ottawa police released photos and a surveillance video following the home invasion. Ernest Côté, a 101-year-old war veteran, managed to call 911 after the suspect left.
On Monday, CBC News learned that police have linked Bush to an unsolved triple homicide that involved victims left with bags over their heads.
Retired Tax Court of Canada chief justice Alban Garon, 77, his wife Raymonde, 73, and their friend Marie-Claire Beniskos, 78, were found dead in the couple's Ottawa apartment on June 30, 2007.
The three had been beaten, bound and left with bags over their heads, sources told CBC News. They all died of suffocation, sources said.
Garon had retired as chief justice in 2004.
In 2008, Ottawa police offered a $100,000 reward for information leading to a conviction in the case.
Bush, who has no previous criminal record, is currently undergoing a court-ordered psychiatric assessment at the Royal Ottawa Mental Health Centre.
Côté had been alone in his apartment at 31 Durham Private. when a man claiming to be a City of Ottawa employee asked to be buzzed into the building on the morning of Dec. 18.
Once in the building, a man forced himself into Côté's apartment, tied him up and robbed him, police said at the time.
Côté suffered only minor injuries and did not need to be taken to hospital.