[1] On 23 May 2013, the Czech police charged in absentia 20-year-old U.S. national Kevin Dahlgren, Veronika Haroková's cousin, with committing the quadruple murder.

[2] At the time he was charged, Dahlgren was on a flight bound for Washington, D.C.; he spent two years and three months in custody in the U.S., fighting extradition.

[2] In March 2016, the police closed their investigation; a month later, the State Attorney indicted Dahlgren for committing the four murders.

[5][6] Dahlgren was sentenced to life in prison on 20 July 2016; he appealed the verdict[7][8] but in March 2017 the original ruling was upheld.

[12] Veronika Haroková (aged 46) worked as a teacher of History and the Czech language, and was also a pupil counselor at a Brno grammar school.

The youngest of the victims, David (aged 16), was a student, described as a promising soccer player in the Czech media.

[13] From the absence of defensive marks on their bodies, it is clear that the victims were attacked in succession, not expecting the assault.According to Czech media reports, the authorities reconstructed the case as follows: In the early morning of 22 May 2013, a girlfriend of one of the sons left the house.

[15] At 6:40 AM, Veronika Haroková called the grammar school where she worked, saying that she had a bad headache and would take the day off.

[16] Meanwhile, the fourth victim, David, who was at school, received text messages from Dahlgren's phone that they would go running after his return.

The neighbors entered the garage intending to extinguish what seemed to be a small fire only to find three charred bodies inside, whereupon they immediately alerted the authorities.

After considering an emergency landing or returning to Vienna, the pilots decided it would be safer to continue the flight.

Immediately after landing at Washington Dulles International Airport, the plane was boarded by U.S Customs and Border Protection Officers, who arrested Dahlgren and turned him over to the FBI.

[23] The Czech police made it public that they considered Kevin Dahlgren the prime suspect only after his arrest in the US, citing fears that he might have learned about his "wanted" status while on board the airplane, and react by endangering other passengers.

[2][24] Kevin Dahlgren was a 20-year-old native of Sacramento, California, where he graduated from Granite Bay High School, and was Veronika Haroková's cousin.

[27] The Harok family learned about Dahlgren's plan to come to the Czech Republic only a couple of days in advance, when he contacted them, saying that he had already bought an airline ticket and that he expected them to pick him up at the airport.

[31] An application for Dahlgren to be placed in custody was brought by Assistant United States Attorney Patricia Haynes and approved by Magistrate Judge Theresa Carroll Buchanan the next day.

According to the Czech Ministry of Justice, Dahlgren could not be prosecuted in the US for crimes committed abroad, and if not extradited, he would have walked free in the United States.

[35] Concluding that the state needed to prove only probable cause, Davis ruled that Dahlgren could be extradited to the Czech Republic.

[38] On 1 July 2015, the court in Virginia heard Dahlgren's filing for a writ of habeas corpus and decided that the detention was lawful.

[41] After learning that their prime suspect had left the country, on 23 May 2013 the Czech authorities charged Kevin Dahlgren in absentia with committing the quadruple murder.

[28] According to the indictment, a combination of Dahlgren's personal attributes and situational motivations led him to commit the murders: he was emotionally unstable and narcissistic, and he became aggressive when he found himself unable to fulfill the expectations of his relatives.

[28] The state attorney also presented Dahlgren's testimony before the FBI, given after his arrest in the US, in which he claimed that he got into a conflict with an unknown group of Russians or Romanians the night before the murders.

The youngest of the victims was incapacitated by a blow to the head with a blunt object, most probably a stone found by police, and subsequently stabbed multiple times, dying due to a cut throat.

[28] The older son was murdered while lying in his bed, also suffering numerous stab and slash wounds to the head and neck.

In Brno, he first felt fine: however, later Mr. Harok Sr. started asking him to find a meaningful occupation, which meant that he was in the same position as back in the US.

The defense attorney criticized the psychiatrist claiming that American specialists found that he was suffering from bipolar-type schizoaffective disorder.