Refusal and Martyrdom
Following the Axis invasion of Yugoslavia in April 1941, Bosnia and Herzegovina were incorporated into the Independent State of Croatia, and its Ustase authorities began a campaign against the Serbian Orthodox population. The local commissioner ordered those born in Serbia, the bishop among them, to leave the territory. Platon refused, declaring in a letter that he would not abandon the flock entrusted to him.
He was arrested on the night of 4-5 May 1941, together with other prominent Serbs and Orthodox clergy, and was killed soon afterward along with a fellow priest. According to the accounts of his life, he was subjected to severe torture before his death; his body, scarred and disfigured, was cast into the Vrbas River and was recovered on 23 May 1941. He was buried at the military cemetery in Banja Luka. His relics were later exhumed and reinterred within the Church of the Holy Trinity in Banja Luka.