Apprentice star Stuart Baggs died as a result of his asthma, which he had suffered from for many years.
The 27-year-old, who ran a communications firm on the Isle of Man, was found dead at his home in the island's capital, Douglas, at around 9am on Thursday July 30.
A statement released by the Isle of Man Constabulary said a coroner found Baggs died of natural causes.
"Mr Baggs had suffered from asthma for many years and died as a result of his condition," the statement said.
At 21, Baggs was the youngest candidate when he appeared on the BBC One show in 2010.
He was knocked out at the interviews stage and the series was eventually won by Stella English, but he became a cult favourite with his steady stream of catchphrases and his description of himself as "Baggs the brand".
Inspector Michelle McKillop said: "From the reaction we have encountered during our inquiries it is clear that this is a tragic and premature loss of such a hardworking and visionary young man.
"We extend our thoughts to the family at this sad time and on their behalf I would request that they are now left in peace to grieve as a family."