He worked at the Czechoslovak State Railways as a junior railroad engineer, train operator, worker at a heat-only boiler station, woodcutter and zootechnician.
When his crimes were investigated, he demanded the testimony of cardinal Miloslav Vlk and Abbot of the Brevnov Monastery Jan Anastáz Opasek.
One of his Roubal's sons also supposedly said that his father killed both Heppner and Natasha and had given their bodies to the pigs, however, he denied ever saying that in court.
On 12 November 1993, Václav Dlouhý, who made a living through selling porn movies, was found dead in his apartment in Letňany.
In the evening he came to the ZAPAP car rental office, which was located in the basement of Pod Zvonařkou 2238/4, Prague 2, where he encountered the owner Petr Kudrna, Peter Magdolen and the occasional visitor of the taxi driver Jiří Semerád.
Kudrna and Magdolen were strangled with the weight of their own legs, but Semerád managed to free himself and call the police.
Many scandals surrounded it, one of them being that Judge Jiří Horký forgot to prolong Roubal's detention and he had to be released on 30 September 1997 from the remand prison.
For misconduct, the judge was later punished by a disciplinary panel of the High Court with a twenty per cent reduction in salary.
In 1998, Roubal was cleared of the murder charges and sentenced to five years in jail for robberies at the ZAPAP car rental.
In the final speech, a public prosecutor who had asked for life for Roubal, announced anonymously that there was an explosive in the courthouse.
He also has asked the court to bring cardinal Miloslav Vlk and Abbot of the Břevnov Monastery Jan Anastáz Opasek in his case.
Roubal continually denied any responsibility, but the court recognized him as guilty of the murders of Kudrna and Magdolen, for which he was sentenced to 22 years in 1999.
In 2010, he sued the VZP insurance company for refusing to provide self-supporting stockings for varicose veins.