Sanson Community Reels as Mark Field Is Named Sole Suspect in Murder-Suicide Fire That Took the Lives of Mia, Harper, and Finn

 The quiet Manawatū town of Sanson is struggling to breathe after police confirmed the unthinkable: Mark Field, 38, deliberately set the fire that killed his three children (Mia, 8; Harper, 5; and Finn, 3) before taking his own life in what is now officially a murder-suicide investigation. The revelation, delivered at a sombre press conference Thursday, has left neighbours terrified and grieving, with one chilling detail emerging that has deepened the horror: Field had purchased 40 litres of petrol from a local service station just hours before the blaze.

Detective Senior Sergeant Chris Lafferty told reporters the evidence was “overwhelming.” CCTV footage shows Field filling two jerry cans at 7:12 p.m. on November 7. Forensic analysis confirmed high concentrations of petrol accelerant in the garage where the fire originated. A handwritten note found in Field’s pocket, addressed to his estranged wife Chelsey, read in part: “I’m sorry. I can’t do this anymore. Take care of the baby.” Toxicology revealed no alcohol or drugs in his system—only prescribed antidepressants at therapeutic levels.

The children died of smoke inhalation and burns upstairs. Mark’s body was discovered in the garage, a single gunshot wound to the head. A legally registered pistol was found beside him.

Neighbours are reeling. “He waved at me that afternoon,” said Sarah Wilkins, who lived three doors down. “He was carrying groceries, smiling. How do you smile knowing what you’re about to do?” Another resident, who asked not to be named, wept: “We keep asking—how could a father do this to his own babies?”

Chelsey Field, 35, who was in Wellington for a teaching conference, collapsed when told the news. She is now under 24-hour care and has not yet seen the letter. Friends say she is “utterly broken” but determined to honour her children at Saturday’s funeral with the lantern release she requested.

Detective Lafferty confirmed Field had been struggling with severe depression and financial stress after losing his job in September. Despite reaching out for help, he was placed on a six-month counselling waitlist. “This is a devastating example of a system that failed when it was needed most,” he said.

The Sanson community has raised over NZ$250,000 for the Field Family Light Fund, which will support child fire safety education and mental health crisis intervention. A permanent memorial garden will replace the destroyed house.

As the town prepares for Saturday’s service, one question lingers in every whispered conversation on Taonui Road: how does love turn into something so dark?

For Mia, Harper, and Finn—three innocent lights—the answer will never come.

But their community vows their memory will shine on.