Passage: Ján Kuciak (17 May 1990 – 21 February 2018) was a Slovak investigative journalist. Kuciak worked as a reporter for the news website Aktuality.sk, focused mainly on investigating tax fraud of several businessmen with connections to top-level Slovak politicians. He and his fiancée, Martina Kušnírová, were shot dead in February 2018 in their home in Veľká Mača, Galanta District, Slovakia.Kuciak was the first journalist murdered in Slovakia since the country's independence. The murders caused shock and disbelief throughout the country, sparking mass popular protests and a political crisis, with the government of Prime Minister Robert Fico on one side, and President Andrej Kiska and opposition parties on the other. The crisis culminated on 15 March with the resignation of Prime Minister Fico and his entire cabinet.In September 2018, Slovak police stated that Kuciak was murdered because of his investigative work, and that the murder had been ordered. They arrested eight suspects, charging three of them with first-degree murder.

Question: What was the nationality of Jan Kuciak?
Slovak