The man, named as 24-year-old John Santos Gurgao from Brazil, swallowed 0.8kg (1.8lb) of the drug, the Irish Times reported.
It is believed that one or more of the packages burst during the flight.
A Portuguese woman in her 40s, also on the flight from Lisbon, was arrested on suspicion of drugs offences.
It is not clear if her arrest is linked to the man's death.
Toxicology tests have been carried out on the consignment found in the man's stomach, which reportedly had a street value of around Â£40,000 ($61,900).
Passengers said the man became agitated and then violent and had to be restrained.
A doctor and a nurse treated the man aboard the plane after he lost consciousness.
The captain declared a medical emergency and diverted the plane to Cork airport, landing early evening local time.
About 170 passengers and crew members were taken from the aircraft and were interviewed by police about the incident.

King Bhumibol Adulyadej has had a lengthy spell in hospital in Bangkok and has not been seen in public for months.
The king is widely revered and seen as an arbiter in the country's divided political arena.
Thailand is preparing to celebrate 70 years of his reign on Thursday.
The monarch was treated for narrowing of the arteries with "satisfactory results", the palace said in a statement.
Doctors performed a procedure known as balloon surgery to widen the arteries on Tuesday after tests had shown insufficient blood in the heart muscles, the statement said.
In the past month, the king has also been treated for a build up of fluid surrounding the brain and a swollen lung.
An X-ray on Saturday showed less fluid around the brain, the statement said.
The monarch's health is closely watched in Thailand as he is seen as a unifying symbol and pillar of stability in a society that has suffered increased political divisions and violence.

The 28-year-old, who has 69 caps for his country and represented the British & Irish Lions, will join Quins next season.
Roberts had turned down a deal to return to Cardiff Blues, where he spent six years before moving to France.
"The whole club is ecstatic to have signed a player of Jamie's quality," said director of rugby Conor O'Shea.
"He is massively ambitious and, as a role model to all of our players, he will be someone we can all learn from."
Had Roberts opted to return to Wales, Blues would have had first refusal on Roberts's services under a Welsh Rugby Union agreement with the nation's four regions.
Instead the Newport-born player, who has won the Six Nations three times with Wales, including two Grand Slams, will play in the Premiership at the Twickenham Stoop.
Wales head coach Warren Gatland said earlier this month that a move to England would not preclude Roberts from selection for Wales.
Under the so-called 'Gatland's Law', Wales-based players are likely to be favoured for Test selection over those who choose to play elsewhere.
Roberts, who made his international debut in 2008, will also study part-time for a Masters degree in medical science at Cambridge University during his time with Quins.
"Having played in Cardiff and in Paris, moving to London is a chance for me to experience and further develop my career in a different league," said Roberts.
"My desire to compete and win at both club and international level remains as strong as ever."
Roberts will link up with Harlequins in December, after the Rugby World Cup, and has signed a two-and-a-half-year deal which will run until the summer of 2018.
A man who died after being restrained on an Aer Lingus flight to Dublin had reportedly ingested a number of small packages of cocaine.
[NEXT_CONCEPT]
Thailand's 88-year-old king, the world's longest-reigning monarch, has undergone heart surgery, the Thai Royal Household Bureau said.
[NEXT_CONCEPT]
Harlequins have agreed a deal to sign Wales centre Jamie Roberts from French Top 14 side Racing Metro.