Coroner Scott said he hoped his finding would end speculation in the Stratford community about the circumstances around Mr Murphy's death.
Meanwhile, a coroner has found a 48-year-old Northland man drowned when he fell from his dinghy while rowing out to his yacht.
The body of Ronald Raison was found at Tangitu Bay, Kerikeri on August 27, 2010. He was last seen a fortnight earlier on August 13, 2010.
Mr Raison lived on a yacht moored in Matauwhi Bay, Russell, and used a small dinghy to get to and from the yacht.
He had been drinking with a woman the night he disappeared and had intended to return to his yacht to sleep that night, the coroner said.
His dinghy and some of his belongings were found washed up in the sand near Te Wahapu Road, Russell on August 14.
Coroner Marshall said the weather was not good when Mr Raison attempted to return to his yacht.
Coroner Marshall said the most logical explanation for Mr Raison's death was that while attempting to reach his yacht he had fallen out of his dinghy and drowned.