Mrs Letts-Beckett was originally thought to have drowned in a lake when she fell from a boat because she was not wearing a life jacket and could not swim.
However, police announced in June last year that they were treating her death as a homicide and Beckett was charged with first-degree murder.
Beckett was a Napier City councillor for one term, from 1998 to 2001, and ran a tourism business taking Unimog tours to Cape Kidnappers.