No bodies were ever found and, while the police believe it to be a murder-suicide, Mike's mother, Fiona Lu, believes her son is still alive and the presumed deaths staged.
One News reported the hearing would resume today with fresh evidence from five new witnesses.
The new information to be presented at the Coroner's Court includes a further report from an expert who examined discharged items at the remote cliff top.
After Ms Lu and Mr Beckenridge separated, Mr Beckenridge, a Queenstown helicopter pilot, broke a court order and drove to Invercargill to pick up his stepson from school on March 13, 2015.
The boy was upset by a court order to live with his mother, and 20 emails to his stepfather were read out during the first stage of the hearing.
Mr Beckenridge’s final text to the boy’s mother was also read out.
"You have destroyed my life and Mike’s. Me and Mike are leaving now on the Midnight Express 3 mins to departure. Bye my love and thanks for everything JB and MB [sic]."
Ms Lu said her ex-husband, who used four aliases, was capable of faking his death and disappearing.
A New Zealand woman on holiday in Gili Air Island in Indonesia contacted police to report seeing the boy and his stepfather together three months after the car was found submerged.
She told the coroner she was "100% sure" she had seen them.
Family private investigator Mark Templeman told Coroner Marcus Elliott that Ms Lu believed her son, who would now be 21, would contact her when he was no longer under the influence of his stepfather.
— APL
