Embattled Toronto mayor Rob Ford has become embroiled in a fresh controversy, just two days after admitting to having smoked crack cocaine.
The footage looks as though it was secretly filmed on a mobile phone.
In it, an agitated Mr Ford paces a room gesticulating during a foul-mouthed rant. The context of the clip is not clear, nor is the target of Mr Ford's wrath.
He vows to rip out the person's throat, poke out his eyes and ensure his victim is dead.
The mayor appears upset at someone who has called him and his brothers "liars, thieves".
"No holds barred, brother," Mr Ford says in a raised voice. "He dies or I die."
An off-camera voice eggs on Mr Ford, saying: "Mike Tyson!"
After viewing the clip outside his office, Mr Ford told reporters: "It's extremely embarrassing and I don't know what to say," the BBC reports.
"I hope none of you have ever or will ever be in that state. The whole world is going to see it," he said of the clip.
Allegations of drug use by Mr Ford surfaced in May when journalists reported seeing footage of him smoking crack cocaine.
The leader of Canada's biggest city told reporters he had been "extremely inebriated" in the clip, which shows him apparently blowing off steam.
Councillors are stepping up their calls for Mr Ford, 44, to resign.