[1][3] He won a bronze medal at the 1971 European Amateur Boxing Championships from Madrid, defeating Antonio dos Santos and Harald Skog before losing in the semi-finals to Mate Parlov.

[1][2][4] In 1972, Stump participated at the first edition of the Golden belt international tournament, organized by Romania, reaching the final where he lost in front of Gilberto Carrillo.

[1][6][7][8][9] In April 1977, Associated Press and Agence France-Presse wrote about the incident and United States president, Jimmy Carter showed his concern for Goma.

[1][6][8][9] Pacepa also says in his book that Ceaușescu asked for Stump to be disguised as a street sweeper in order to catch and assault a foreign diplomat who had refused to spy for Romania.

[1][8][9] Horst Stump died in November 2018 in Popești-Leordeni, after spending the last years of his life struggling with poverty and living in a shipping container.