A human skull found in an Alaskan park earlier this month is that of a restaurant owner who disappeared a month after his establishment burned down last year, authorities said.

Prior to his death, Chung Ho Kang, 61, had been working with investigators to determine what caused the Dimond Bar-B-Que Pit in Anchorage to burn down in March 2018, reports said. Brian Dean, a fire inspector with the Anchorage Fire Department, said investigators found evidence suggesting the fire was set intentionally.

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He said the door to the restaurant had been forced open. The fire is still under investigation, he said.

Kang’s remains were found early January in a park after a dog spotted them. His death has not been determined, the Anchorage Daily News reported.

Kang spent the month leading up to his disappearance working with fire investigators and planning a trip to California, his daughter Jieun Kang told the paper.

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His wife said his mood had changed since the restaurant was destroyed.

“She thought he looked a little depressed after the fire,” Kang’s daughter Jieun Kang said.