Tags: Criminal.
Johannes Franciscus Alphonsus Marinus (John) Opdam was a Dutch murderer.Opdam was born in October 1916 in Surabaya Dutch East Indies. In 1936 he moved to the Netherlands. There he studied medicine and married Arnolda van Eyl a teacher’s daughter.During his wife’s vacation in 1951 Opdam had an affair with the couple’s maid Nellie. Mrs. Opdam found out but being a devoted Catholic there was never any question of a divorce. Instead Nellie was sacked.