Svetlana Milchevich, an evangelical Christian who became a voice of the voiceless with her public fight against abuse of power and corruption by Ukrainian authorities, has died after officials refused to allow her to seek medical treatment in neighboring Hungary. She was 64.

“Svetlana Milchevich, who suffered of stomach cancer, peacefully passed away and is now with the Lord,” said her family in a statement. Milchevich died in a cold, run-down hospital of Ukraine’s western border town of Uzhhorod, where doctors were struggling to find enough pain killers for her and other patients.