A man who was causing a disturbance outside Universal Studios in Florida died after being shocked with a Taser stun gun by off-duty police, US authorities have said.

Adam Spencer Johnson, 33, was said to have been acting irrationally when the five officers approached, police said.

The officers used a stun gun because Johnson was "violently" resisting arrest, said Sgt Barb Jones.

Mr Johnson became unresponsive on the ground and was later pronounced dead.

The off-duty officers responded to a call from a security guard at Universal Studios early on Friday morning about a man acting irrationally outside the Cinemax theatres in the city of Orlando.

"He was kind of pacing around, grabbing his beard, grabbing his head and hair, and they were trying to get a hold of him. He was being disorderly," said Sgt Jones, of the Orlando Police Department.

One officer shocked Mr Johnson with a Taser stun gun, before placing him under arrest.

Police said they immediately tried to revive Mr Johnson when he became unresponsive. He was later declared dead at Dr Phillips Hospital.

All officers involved in the incident with Mr Johnson, who was a resident of Winter Haven, are being placed on administrative leave during the investigation.