Koenig had appeared as Richard 'Boner' Stabone in the 1980s sitcom, the neighbour of Cameron's character Mike Seaver.
In a statement to People, Cameron said: "It is with great sorrow to hear about the final outcome of the search for my old friend Andrew.
"I hope everyone will be sensitive to the Koenigs and give the family some private time to reflect and to grieve the loss of their beloved son."
He added: "At a time like this, we all are reminded of the briefness of life and the importance of being ready for our eternal destination. My prayers will continue to be with Andrew's family"
> Koenig's family 'appreciate support'