Olaf Däter (born 25 September 1969 in Bremerhaven) is a German spree killer who has been dubbed as Oma-Mörder ("Granny-Killer") by the media.

Hans Helwig (25 September 1881 – 24 August 1952) was a German Nazi Party politician, World War I veteran, Schutzstaffel general and Nazi concentration camp commandant. An early member of the Nazi movement he fulfilled a number of roles within Nazism down the years.

David Groves, better known by his birth name Patrick David Mackay (born 25 September 1952), is believed to be one of the United Kingdom's most prolific serial killers. He was convicted of three counts of manslaughter and two additional cases that were left to lie on file.