Police say the incident began when the man approached two officers inside the Venetian hotel and casino about 1am Sunday, reports the AP.
Police say the man was acting erratic and said people were chasing him.
Police said an officer then used a stun gun, which affected the man.
LAS VEGAS (AP) - The death of an unarmed man after police squeezed his neck during a struggle to subdue him outside a Las Vegas Strip casino raised questions Monday about the risks of the technique created to restrict the flow of blood to the brain.
A police officer squeezed Brown's neck from the side before Brown lost consciousness, according to the police account.
The Office of Internal Oversight and Constitutional Policing is investigating the man's death.
"Too many people have died as a result of this type of excessive force", Tod Story, executive director of the ACLU of Nevada, told NBC 3. Venetian security guards also joined the struggle, police said.
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More than 500 USA law enforcement agencies use the LVNR technique, which was first employed by American policing agencies in 1970, according to the Las Vegas Sun. Police said they had attempted CPR on the scene.
Brown's mother didn't immediately respond to a telephone message seeking comment. Per deppolicy, the identity of the officer involved will be released after 48 hours, per department policy.
The brand of chokehold in question - a blood choke, or a Lateral Vascular Neck Restraint (LVNR) technique, in sanitized police vernacular.
The organization calls neck restraints "a safe, viable and effective option for police officers in arrest and control scenarios".
Speaking to local media last week, Undersheriff Kevin McMahill said: "Our officers are trained to exhaust all of their options before resorting to the use of deadly force".
"Carotid artery versus airway".