Dirk Cresswell (1961-1998) was a Muggle Born wizard who worked at the Ministry of Magic.
Dirk was born September 1961 somewhere in the British Isles to the Muggle Cresswell family. He started to show magical abilities at the age of 11 so was invited to Hogwarts School Of Witchcraft and Wizardy. He became a favourite student of Potions master Horace Slughorn. He then went on to work at the Ministry and many of his colleagues, such as Arthur Weasley, considered him as a very powerfull wizard. When the ministry was took over by Voldemort he attempted to use a forged family tree in order to claim his family heritige, but was discovered by Albert Runcorn. He then went on the run and was caught and killed by Snatchers.
Dirk was played by [Ricky Wilson]but wasn't credited or identified in the film.