Police say the Manus man was killed after he was speared in his left chest.
The killing took place last Friday at Bundrahei village, Pobuma LLG, in the south coast of Manus.
The deceased, Allan Damien, was from Likum village, also in the same LLG.
Manus provincial police commander, Chief Inspector David Yapu, says his officers were deployed to monitor the area due to the tense situation.
“The incident occurred over theft of betelnut in the betelnut block,” he says.
A suspect has been apprehended and is in custody pending further investigation.