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.
In a statement to ITV News, a spokesperson for Thomas Cook confirmed that the firm's chief executive sent a letter to the parents of two children who died from carbon monoxide poisoning in Corfu.
Neil Shepherd and Sharon Wood claim they were only shown the letter by reporters.
The spokesperson for the holiday company refused to share any further details about the letter.
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.