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.
The boss of Thomas Cook has said he will not appeal an inquest ruling which found his firm "breached its duty of care" over the deaths of two children.
Christi and Bobby Shepherd died from carbon monoxide poisoning while on a Thomas Cook holiday in 2006.
The tour operator's chief executive Peter Fankhauser told ITV News Business Editor Joel Hills he now accepts the inquest findings.
He admitted the company had "made many mistakes over the years" and said it was only when he was confronted with the Shepherd family's grief that he personally wrote them an apology.
And despite the hostile headlines and a drop in share prices, Fankhauser claims the 150-year-old company is still doing well.
Read more: Thomas Cook boss 'deeply sorry' over children's deaths
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.