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 says it has donated to charity a £1.5 million compensation payout it received following the deaths of two British children in Corfu.
The holiday firm was widely criticised when it emerged that it had received the sum after Bobby and Christi Shepherd were killed by carbon monoxide poisoning while on holiday in Corfu in 2006.
In a statement, Thomas Cook's chief executive sought to deny accusations his firm had profited in any way from their deaths.
Peter Fankhauser said: "Thomas Cook has not in any way profited from our claim against the hotel owner. In late 2012, we brought a claim against the hotelier for breaching their contract to provide safe accommodation to our customers and to comply with all applicable laws which was decided in our favour.
"Today I have made arrangements for the full amount - £1.5 million - to be donated in full to Unicef, the world's leading children's organisation.
"I believe this is the right thing to do and I apologise to the family for all they have gone through."
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.