New findings and possible additional victim In July 1984, excavators examining Trobec's homestead in Dolenja Vas found additional documents belonging to Markovčič, but when they examined a hollowed-out brick wall, they found the ID and health card of an unfamiliar woman. Upon examination, it was discovered that they belonged to 45-year-old Olga Pajić, who had disappeared on August 9, 1975, while on
sick leave and supposedly had gone to Ljubljana to buy shoes for her husband. She never returned, and was reported missing two months later. When he was shown the documents, Trobec claimed that he knew Pajić and that he had stolen her documents after he killed her during a fight. Like the other victims, he then burned her remains in the oven. According to him, she was his first victim, not Markovčič, and he used this opportunity to deny killing Brečko. A murder indictment was issued to the Prosecutor's Office in Ljubljana, but for reasons unknown, Trobec was never put on trial for this alleged murder.
Prison assaults 1988 and 1990 incidents Following his conviction, Trobec was transferred to the Dob pri Mirni Correctional Facility in
Slovenska Vas. During his stay there, he got into a confrontation with inmate Vinko N., who was temporarily transferred to another prison in Ljubljana. Vinko N. wrote several requests not to be returned to Dob pri Mirni, but was moved there against his will in early May 1988. On May 23, while talking with a group of inmates, Trobec - who had just been released from
solitary confinement - came up behind him and stabbed him twice in the chest and the right side of the abdomen with a 7.5 cm long
shank. After stabbing Vinko N., Trobec handed the knife over to the approaching guard and said it had snapped. On January 30, 1990, while he was on leave in a special ward where convicts could move to other rooms, Trobec stabbed Zlatko K. in the right leg with a 7.6 long pocket knife, inflicting a 1 cm deep and 2 cm long cut.
1992 incident On August 28, 1992, during a prisoners' walk, Trobec stabbed inmate Miloš Nemec with a sharpened cutlery knife seven times in the chest and three times in the limbs. The supposed motivation was an old grudge between the two men. Trobec was put in solitary confinement and was defended by two guards with a dog from the enraged prisoners. He was then moved to another prison in
Novo Mesto, where guards soon found a note detailing an escape plan involving the attack on a certain guard and using his keys to free fellow prisoners who were aware of the plan.
Tear gas was also found in the cell. Trobec was unpopular with other inmates and a loner, and after his attack on Nemec, other inmates protested to the Minister of Justice , demanding separate housing for problematic prisoners and smaller accommodation facilities. Kozinc promised that he would propose to the assembly to allocate more money for this. Soon after, Trobec was temporarily moved to a prison in
Maribor, considered one of the safest in the country, due to the increasingly violent threats against him from fellow inmates. During his stay there, he was ordered to live and walk separately from others and was prohibited from participating in work that involved other inmates. As he was a flight risk, he was put under strict surveillance. Trobec was eventually returned to Dob pri Mirni in September 1993.
Assault trial and extension of sentence At the beginning of 1993, the Novo Mesto District Court sentenced Trobec to 10 years and 6 months imprisonment for attempted murder and causing minor bodily harm for the 1988 and 1990 stabbings. He did not defend himself and remained silent throughout the proceedings. The court decided that this should be considered a separate sentence, and on February 25 of that year, the High Court of Ljubljana rejected an appeal from Trobec's lawyer. The Supreme Court refused to review the judgment, allowing Trobec's already-existing sentence to be extended. Trobec's defense counsel then filed an appeal regarding the change of the court psychiatrist, who said at the main hearing that Trobec had minor mental impairments. The High Court of Ljubljana overturned the verdict on the grounds that it was still unclear whether the accused was fully cognizant of what he had done, and the fact that the psychiatrist's oral opinion differed from the written one. On March 3, 2000, Trobec's retrial began. When offered a chance to speak, Trobec claimed that a guard had allegedly given him a letter from Miloš Nemec, in which Nemec supposedly threatened to kill him while Tronbec was under the influence of alcohol and sedatives. These claims were rejected by the prison staff and psychiatrists, who pointed out that Trobec was never given alcohol and was fully sober when he attacked the other inmate.
Slavko Ziherl, an expert in the field of psychiatry, stated that Trobec is a paranoid, dissocial and narcissistic individual who showed signs of mild brain damage, possibly due to his upbringing. Nevertheless, he reiterated that he was fully aware of what he was doing. As a result, all of Trobec's subsequent appeals were rejected and his 15-year sentence was upheld. In March 2001, he was moved to a prison in
Koper.
Lawsuit against Lea Eva Müller On March 29, 2000,
animal rights activist Lea Eva Müller gave an interview on
24UR, giving vivid descriptions of Trobec's supposed
torture of animals at a young age. When he learned of this, Trobec sued her for 18.5 million
tolars for defamation and slander. Müller said that her source for these claims was Barbara Juvan (or Jovan), the president of the Domžale Society Against Animal Cruelty, who had read an article from
Jana Magazine from April 1988 which supposedly claimed that Trobec's mother and sister had seen him torture animals. Juvan later said that she did not remember, but that it was possible she might have said this. In the end, Trobec himself withdrew the lawsuit and all charges against Müller were dropped. ==Suicide==