Roadside bombs continue to be the most prolific killer of troops here.

Was a Hungarian countess the world's most prolific serial killer?

He is the most prolific serial killer China has seen.

He is best known by his reputation and conviction as a prolific serial killer of children.

Here we have a man presumed to be the most prolific serial killer.

A trash masterpiece about one of the most prolific serial killer...

He was Australia's most prolific serial killer to date.

Turner holds the dubious record of being the most prolific serial killer in Los Angeles' history.

The promotional poster similarly calls Gustave "the most prolific serial killer in history".

(inspired by a prolific killer in Tucson) appeared in 1966.