A Miami Beach man was arrested after he allegedly head-butted another driver and threatened to kill three people with a knife during a road-rage incident in the Florida Keys, officials said.

James Varner, 55, was charged with aggravated assault and battery, Monroe County Sheriff's Office officials said.

Authorities said the incident began around 3:35 p.m. Monday on Stock Island when the victim drove around a slow-moving vehicle that was being driven by Varner. Monroe County Sheriff's Office

Varner followed the victim to a home and approached him while yelling before he head-butted the victim, officials said.

A fight ensued, and two of the victim's family members came outside to break up the altercation.

That's when Varner allegedly went to his vehicle, grabbed what was described as a

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