Admiral Art McDonald, has stepped down ahead of an investigation into unspecified allegations.
Defence Minister Harjit Sajjan made the bombshell announcement late last night.
He said McDonald left the post voluntarily, and the Canadian Forces National Investigation Service had been tasked to look into the matter.
Lieutenant General Wayne Eyre is taking over the role of acting chief of the defence staff.
Region Trims More from Budget
A further look by Chair Bob Gale and staff dropped the increase to 6.3%
Cold Weather Policy for Homeless Not Changing
Niagara's public health committee shown the system works
Niagara Falls Handling Salt Shortage
The city says there's a North America wide shortage
Man Killed in Tent Fire
Update: Police were called to Mountain Locks Park
Region Updated on Measles Outbreak
Health committee told more work is needed, but gave nod to health care workers for their efforts
St. Catharines Draws X Through X
The city has decided to stop using the social media platform
Police Looking for Laundry Thief
They say she stole some money last month
Toronto Man Charged with Trafficking
Police made the arrest with help from Niagara Parks police, finding fentanyl and cocaine earlier this week