Juhani Aataminpoika, Finnish serial killer (died 1854)

Juhani Aataminpoika alias Kerpeikkari, was a Finnish serial killer. He killed 12 people in southern Finland between October and November of 1849. He has been characterized as the first serial killer in Finland.

July 31 is the 212th day of the year in the Gregorian calendar; 153 days remain until the end of the year.