Date of Birth: 
About Otto Johan Tandefelt
- Otto Johan Tandefelt born 13 April 1782 in Sysmä, Voipala, Finland was a Swedish Finn.
- He most likely died in America. He was a key figure in the lynching of Axel von Fersen on June 20, 1810 in Stockholm.
- He was the alleged murderer. After serving some years at Älvsborg fortress, he was pardoned by King Charles XIII, and eventually emigrated to America under the name of Pettersson. He was a nephew of Adolf Tandefelt.
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