ITV News has learned that a man convicted over the gas deaths of two children in Corfu has been working at another hotel used by Thomas Cook.
George Chrysikopoulos was found guilty of negligent manslaughter by a Greek court and sentenced to seven years in prison.
Following ITV News' investigation, Chrysikopoulos was sacked by the hotel yesterday at the insistence of Thomas Cook.
Thomas Cook has admitted it received compensation from the Greek hotel after two British Children died from carbon monoxide poisoning.
The travel company would not admit how much they were paid out in 2013, but it has been reported to be around £3.5 million.
However, the parents of Bobby and Christi Shepherd - who died in 2006 aged six and seven - say they only received around one tenth of that sum in compensation.
"It seems our children's lives are worth only a fraction of Thomas Cook's reputation," the children's mother Sharon Wood told the Mail on Sunday.
Mrs Wood said her family is "incensed" that the firm sought to claim back costs after a 2010 criminal trial in Greece during which three employees from the Louis Corcyra Beach hotel were found guilty of manslaughter.
The boss of Thomas Cook said he is "deeply sorry" over the deaths of two British children killed by carbon monoxide poisoning in Corfu.
Kristine Williams, 61, claims she was electrocuted and 'thrown across the room' after accidentally touching the wires at a hotel in Cuba.