Justin Jordanoff, 44, was holidaying at the popular Mahana Point on Nusa Ceningan when he jumped from a diving board into the ocean.
According to 9 News, the Busselton local leapt off the cliff, and was able to walk out of the water, down to the nearby Blue Lagoon Beach.
But, according to the 9 News report, he lost consciousness, after feeling dizzy and hot.
Mr Jordanoff was rushed to hospital but was pronounced dead on arrival.
An autopsy will confirm Mr Jordanoff’s exact cause of death, but his family suspects he may have suffered a heart attack.