In the true crime story "And the Sea Will Tell", how was the man (couple?) caught?

Question

And how were the police able to identify the ashes in the drum barrels as human?

Answer 1

He was caught because she turned him in.This guy was a real piece of work,stupid is an understatement.After they made it back to Hawaii,he continued to live on the victims boat.So it did not take very long forFiveO to nab him.She denied having any knowledge of the crimes and I guess a jury must have beleived her because I don't think she done very much jail time if at all.Palmyra is a Pacific Atoll used by the Navy in WWII as a refueling stop for submarines.It was and still is privately owned.