Gardai are investigating the possibility that the man who died on board an Aer Lingus flight bound for Dublin yesterday may have been a drugs mule.

A number of suspicious packages were recovered during a post mortem on the body of the 24 year old Brazilian.

The post mortem was completed at Cork University Hospital this afternoon, and a number of packages removed from the man's body.

These have been sent for forensic testing, and Gardai investigating his death are also awaiting a toxicology report.

The 24 year old became highly agitated around an hour in yesterday's flight, had to be restrained, and subsequently had a seizure.

He was pronounced dead after the flight landed in Cork.

The aircraft - which Gardai had been treating as a crime scene - has since been released back to Aer Lingus.

Another passenger remains in Garda custody on suspicion of a drugs offence.

Gardai in Cork are continuing to question the 44 year-old Portuguese woman who was travelling with the 24 year-old, on suspicion of drug trafficking - after two kilos of a powdered substance was found in her luggage.

She is being held at Togher garda station in Cork.

Flight EI-485 was diverted to Cork as crew tried to deal with the man, who was having a medical emergency. He had become agitated and had to be restrained. He bit a man during the incident.

The man who was bitten was treated in hospital for his injuries.

Crew members were unable to help the man and he was unresponsive when the plane landed. Emergency service personnel pronounced him dead on arrival.

Gardaí investigating the man's death interviewed all 168 passengers and six crew on board the diverted plane.

Aer Lingus described the incident as a "medical emergency".

John Leonard was on the plane when the drama unfolded. He has been speaking to Newstalk Lunchtime.