Family of missing man Sam Newton-Jones say he is dead

The family of missing man Sam Newton-Jones say they now know he is dead.

The 33-year-old PhD student was last seen at his workplace in the suburb of Henderson on 20 October.

Police later found his car at the Mercer Bay Loop car park near Piha beach with no sign of Newton-Jones.

A Givealittle page set up by a friend said the "much-loved husband, father, son, brother, and friend" had "tragically and unexpectedly died".

"This isn't an update anyone ever imagined we'd have to send, but we know now that Sam has died," the page said.

All funds raised would go to Newton-Jones' wife Annie and their daughters Lou and Juno as they grieve the loss.

"Sam was warm, empathetic, kind, and incredibly generous. Sam played a significant role in the lives of his family and friends, and will be missed deeply."

Police said last month that they were using a range of resources in the search efforts, focused on the area around Piha beach.

Newton-Jones had been an engineer, but decided in his mid-20s to re-train as a psychologist.

The family had described Newton-Jones last month as a much-loved son, husband and father-of-two.

"He has a passion for working with children and young adults and helping them to navigate adversity.

"Like many New Zealanders, Sam has experienced his own mental health challenges. However, he recently described himself as feeling optimistic about the year ahead."

The family said at the time that his disappearance is highly out of character.