The chief executive of infidelity website Ashley Madison’s parent company Avid Life Media has left, just over a week after hackers leaked data about millions of its clients in a massive cyber assault. Avid Life said on Friday the departure of Noel Biderman was by “mutual agreement” and its existing senior management team would take over until a new CEO is appointed. On Aug. 18, hackers who claimed to be unhappy with its business practices released the Ashley Madison customer data, and police probing the breach said it had sparked extortion attempts and at least two unconfirmed suicides.