In 2008, the Supreme Court of Serbia sentenced Marković to 40 years' imprisonment for orchestrating a 1999 attack on Serbian opposition politician Vuk Drašković.
During his career which lasted from 1970 until 2001, he served several and head positions of the Serbian Police during the 1990s and as the assistant Minister of Internal Affairs (August 1993–1994).
[1] Under Yugoslav president Slobodan Milošević, Marković was appointed to succeed Jovica Stanišić as the head of the RDB on 27 October 1998.
[2] After Milošević lost the 2000 Yugoslav presidential election to challenger Vojislav Koštunica, Marković formally resigned his position on 25 January 2001.
[3] Marković was arrested by Yugoslav police in February 2001 and was charged with committing "the criminal act of abuse of official position" by organising the 1999 Ibar Highway assassination attempt of Vuk Drašković, which resulted in the deaths of four people.