In order to feed his addiction, he would initially spend 6,000 CZK a day, but later switched to using buprenorphine and clonazepam, which cost him only 1,000.
On that day, Virgulák hailed a Honda CR-V taxi in central Prague driven by 42-year-old Petr Sedláček, a father of two.
[4] The municipal police ticketed the vehicle for violating parking regulations, with the officers apparently not noticing the body inside the car because of the tinted windows.
[5] On 10 April, at around 11 PM, Virgulák hailed a Škoda Superb taxi on Štěpánská Street, driven by 38-year-old Milan Paris.
[3] He asked Milan to drive him to Uhříněves, on the outskirts of Prague, and when he did, Virgulák pulled out a gun and shot him twice in the head and neck.
After the two April murders, all taxi drivers operating in Prague were warned to only take customers who report to the dispatch center in advance.
Officers noticed that he had one of the murdered taxi drivers' IDs, but at the time, he was still considered only as a possible witness and charged solely with theft.
[5] However, wiretaps were installed in his prison cell, and after listening in to his conversations with his brother, they realized that Virgulák was sharing details only the killer could have known.
[11] The evidence included footprints that matched Virgulák's shoes, a pistol found to be in his possession, gunshot residue, the lack of a strong alibi and the wiretaps.
[12] The prosecution also considered submitting in evidence Virgulák's diary, as he had recorded several dates and written suspicious things that they believed could be referencing the murders, but it was deemed too vague and ignored.
In his statement, the judge called him "unbalanced, internally less stable and dissociative...impulsive and prone to reckless behavior exacerbated by his alcohol and drug addictions, coupled with his aggressive speech.
This referred to the case of Jiří Kajínek, a life-sentenced prisoner who had recently been pardoned by president Miloš Zeman.