Hans Erwin Hagedorn (30 January 1952 – 15 September 1972) was an East German serial killer who murdered three young boys from 1969 until 1971. On 31 May 1969 Hagedorn killed two nine-year-old boys in a forest in Eberswalde with a knife. The bodies were found two weeks later. Extensive investigations were commenced, with a psychological offender profile being assembled and the Ministry for State Security obtaining documents about the case of West German child murderer Jürgen Bartsch. However, first investigations were not successful.