Cory Campbell, 26, was found suffering from a gunshot wound in the hallway of an east-end building on the evening of Sept. 8.
Campbell was rushed to hospital, where he succumbed to his injuries.
A post-mortem examination determined that Campbell died of a gunshot wound to the chest.
Just over a day after Campbell’s death, police announced the arrest of Andrew Burnett, 25, of Toronto, on a charge of first-degree murder.
Police say they have now arrested Jeramy Henry, 26, of Toronto, also on a charge of first-degree murder.
Henry was arrested in Ottawa on Saturday.
He is being brought back to Toronto for a court appearance on Sunday.