Mr Thackwray was airlifted to Whangarei Hospital after his heart attack but could not be saved. But within days of his death - between January 15 and 18 - his home was raided by thieves who Mr Samuels said knew the house would be unoccupied.
"How low can you get? Whoever did it knew he had just passed away and there'd be no one home, so they took the opportunity to ransack it."
"Someone in the community will know who it is. I don't believe it was a stranger from out of town," he said.
Mr Samuels said the offenders had emptied out drawers, tipped over furniture and "ransacked the place". He believed the stolen items included a quad bike, television and an outboard motor.
He urged anyone who knew who was responsible to call the police. The house has now been tenanted to avoid further break-ins.
Senior Sergeant Brian Swann, of Mid North police, said two houses at Mahinepua were burgled around the same time and a boat taken from another property.
Police could not be sure whether the offenders knew one of the owners had passed away or were simply targeting coastal properties. He urged anyone with information about the burglaries to contact their nearest police station or Crimestoppers, anonymously, on 0800 555 111.
He also advised coastal residents and holiday home owners to make sure their properties were secure. At this time of year thieves often targeted holiday homes, boats and fishing gear.
Mr Thackwray is survived by a sister, a former wife, four daughters and one grandchild.