Geoffrey Chandler, husband of Margaret Chandler, was the prime suspect for the presumed murder of Dr Bogle and his wife. For many years he maintained (and appears to have believed) that his wife and Dr Bogle were murdered by secret agents, with Dr Bogle the intended victim and his wife the unfortunate casualty who happened to be with him at the time.

More recently, in 2006, he has apparently accepted filmaker Peter Butt's hydrogen sulfide theory as to the cause of the deaths. Interviewed ¹⁷ for Butt's film Who Killed Dr Bogle & Mrs Chandler?, Mr Chandler has also admitted both to having been a member of the Communist Party, and to having been one of ASIO's ¹⁸ people inside the CSIRO.