A Brazilian passenger who died after ‘running amok’ and biting another passenger on a flight from Lisbon to Dublin on Sunday was alleged to have been carrying 800 grams of cocaine in his stomach, with a street value of $63,000.

The man, named as John Kennedy Santos Gurjao by the Irish Times, is believed to have swallowed 80 pellets containing a substance suspected as cocaine. It is understood that one pellet burst in his stomach, causing him to suffer a violent seizure.

The 24 year-old became severely agitated half way through the two hour journey from Lisbon to the Irish capital, which was carrying 168 passengers and six crew members.

All of a sudden, he “ran amok” across the cabin and bit a fellow passenger. He was eventually restrained by the cabin crew. Gurjao became unconscious and a doctor and two nurses who were amongst the passengers rushed to help him.

Man dies after 'running amok' & biting passenger on Lisbon-Dublin flight http://t.co/ObQQKiSxHhpic.twitter.com/yML4kkNoDq — RT (@RT_com) October 19, 2015

“He was actually on the ground shaking violently,” said John Leonard, who was on the flight. “The noise he was making was like something I have never heard before.”

“It’s not something you’d hear every day. It was like deep anguish is the best way I could describe it, very, very troubled,” he added, speaking to a Cork-based radio station.

The plane was diverted to make an emergency landing at Cork Airport. Gurjao’s body was then transported to Cork University Hospital, where his body underwent a post-mortem.

A Portuguese woman in her 40s was arrested after being suspected of drugs offences after a quantity of amphetamines was discovered on the plane.