Police are set to investigate alleged threats made by Willie McKay to senior Cardiff City officials following the fallout from the doomed flight which claimed the life of record signing Emiliano Sala.
McKay is said to have threatened to 'kill everybody' at the club, after being embroiled in the complexities that came following the tragic incident, as report the Telegraph.
McKay was the man who booked the Malibu Piper flight to take Sala from Nantes back to Cardiff, in time for his first training session with his new club after a £15million switch.
The flight never completed its journey and crash landed in the British channel on the night of January 29, claiming the life of Sala.
Cardiff have reportedly been in contact with McKay, who was hired by Nantes to find a buyer for the Argentine striker, to ascertain wider details about the whole ordeal.
McKay is alleged to have threatened to 'kill everybody if my sons get slaughtered,' during conversations which took place on the weekend of Sala's funeral in Argentina.
Both McKay's sons played a role in the transfer of Sala - his eldest Mark being one of the agents involved in completing the deal and his other son, Jack, helping to set up Sala's transport back from France to Wales.
Jack McKay is a striker on the books of Cardiff, though he completed a January loan switch to Chesterfield for the remainder of the season to be closer to his family following the tragic events.
An investigation is now poised to get under way after it was alleged McKay made the threats to specific Cardiff personnel both in person and during telephone conversations.
It's also reported the club have written to his lawyers requesting he desist and banning him from their stadium.
South Wales Police confirmed to the Telegraph: 'A complaint has been received from Cardiff City Football Club and is currently being investigated.'
The Premier League club themselves added: 'It was necessary and appropriate for South Wales Police to be engaged on the matter,' though would not go into specific details.
McKay has repeatedly hit back at any accusations of wrongdoing with his involvement in the Sala transfer, insisting he and his sons have been 'through hell' as a result.
On conviction, a death threat is punishable by up to 10 years in prison.