A group of Papua New Guinea highlanders are on their way to the police station in Enga province to lodge a formal complaint over an alleged brutal axe murder.
A woman named Misila was reportedly killed after locals accused her of sorcery.
Local men who believe in ancestral spirits had blamed three women following a measles epidemic that killed several people in Enga last year.
The women were saved by a Lutheran missionary, Anton Lutz, and policemen in January, after they persuaded the men to give up the superstitious beliefs.
However, Mr Lutz says on Monday ten men came to Misila's home and killed her with an axe.
He says a plane has been arranged to take a group from the village today so they can make a police complaint, which they hope will lead to a formal investigation.
PNG passed a law bringing back the death penalty in 2013, and repealed its archaic Sorcery Law, after a spate of killings.
However the death penalty has not been implemented and the Government says it will be debated again in Parliament this year.