Richard Marx and his wife Daisy Fuentes were on a flight from Hanoi, Vietnam to

Music legend Richard Marx stepped up to the plate, when an unruly passenger got violent on his Korean Air flight.

The Grammy Award-winning rocker was on a flight from Hanoi, Vietnam to Seoul, South Korea on Tuesday when a man sitting a row away from him started attacking flight attendants and other passengers.

In posts on Facebook, Marx and his wife - TV presenter Daisy Fuentes - say he aided the 'ill-equipped' stewardesses in restraining the passenger for nearly the entire four-hour flight.

Pop icon Richard Marx helped flight attendants subdue an unruly passenger on a flight from Hanoi, Vietnam to Seoul, South Korea on Tuesday

His wife, TV presenter Daisy Fuentes, says 'ill-equipped' flight staff struggled to keep the passenger contained to her seat for nearly the entire four-hour flight

The couple says the passenger broke free of his restraints three times during the flight

When the plane landed in Seoul, Marx says local police came on board to arrest the man

Marx sits in his seat during a break from subduing the unruly passenger

Fuentes writes that the male passenger in question 'got crazy and started attacking the flight attendants and passengers'.

'When he started pushing the female staff and pulled them by the hair, [Marx] was the first to help subdue him. This went on for four hours,' she said.

While Fuentes says she feels 'horrible for the abuse the staff had to endure' she says their airline should have better prepared them for situations like this.

The flight attendants had a taser, but had not idea to use it. Nor did they know how to use the rope restraint, leading the man to break free from his binds not once but three times.

On his own Facebook page, Marx wrote that the crew was 'completely ill-prepared and untrained' for the situation.

Marx complained on Facebook that flight crew was not trained for the situation and he had to help intervene

The couple have promised to release video footage of the 'psycho' passenger

Marx and Fuentes are pictured above in a photo from their recent trip to Hanoi, Vietnam

'The all female crew was clueless and not trained as to how to restrain this psycho and he was only initially subdued when I and a couple other male passengers intervened,' he wrote.

Marx complained that Korean Air 'should be sanctioned for not knowing how to handle a situation like this without passenger interference'.

In the end, two passengers and a crew member were injured during the man's in-air breakdown.

When the plane landed in Seoul, Marx says local police came on board to arrest the man.

The couple, who married in 2015, caught a connecting flight to Los Angeles in Soeul. They promised to post a video of the man after their next flight.

In his music career, Marx has sold more than 30 million records - including several number one hits like Hold On to the Nights, Satisfied and Right Here Waiting.

Fuentes made history as the first Latina MTV VJ.