A 55-year-old Hawaii island man, who was set on fire allegedly by his estranged wife, died Wednesday night at Straub Hospital, police said.

The Honolulu Medical Examiner’s Office identified him as Ghenghis Khan Kaaihue, of Holualoa. 

Police reclassified the case from an attempted murder to a murder investigation after Kaaihue was pronounced dead at 11:17 p.m. Wednesday.

Big Island police said a 53-year-old Kailua-Kona woman allegedly doused Kaaihue, her estranged husband, with gasoline and used a lighter to set both of them on fire near a Kailua-Kona beach park Sunday morning.

They were flown to Straub Clinic and Hospital from Kona Community Hospital in critical condition with third-degree burns, police said. 

The woman remains at Straub in critical condition.

The woman confronted Kaaihue, who was with another woman in a van parked on the roadside at Kahaluu Beach Park in Kona and poured gasoline on the van, according to a police report.

Kaaihue left the van and struggled with the woman and gasoline ended up on their clothing and bodies, police said.

Witnesses told police the woman used a lighter to set both herself and Kaaihue on fire.

An autopsy will be conducted to determine the exact cause of death.