Opposition leader Jack Layton died Monday morning at his home.
The Layton family announced the sudden passing in a statement.
Layton had been battling cancer and recently stepped down as federal NDP leader. He, however, had hoped this would be a short time away from politics, optimistic to return when Parliament resumed next month.
"We deeply regret to inform you that the Honourable Jack Layton, leader of the New Democratic Party of Canada, passed away at 4:45 am today," the statement said.