Jangülian interrupted a mass by stepping onto the altar and reading aloud a statement concerning maltreatment of Armenians, which denounced the church's leadership as indifferent.
[6] Demonstrators then forced the patriarch to join a procession heading to Yıldız Palace to demand reforms for the Armenian provinces.
[3] As the procession formed, police surrounded the crowd and shots were fired, resulting in several fatalities, including that of a policeman.
[1] Once free, Jangülian went to Cyprus where he tried to unify the Social Democrat Hunchakian Party, which had become divided over various political disagreements.
[2][11] On 2 June, a group including Jangülian, Rupen Zartarian, Sarkis Minassian, Khachatur Malumian, and Nazaret Daghavarian were taken out.
[2] Ostensibly, they to be sent to undergo a court-martial in Diyarbakir;[11] however, Jangülian along with the rest were executed en route in the area of Karacur between Urfa and Severek (today Siverek).