The conflict climaxed on December 24, 1933, when several men attacked Tourian in the Church of the Holy Cross, in Washington Heights, Manhattan, at the start of the Christmas Eve service. Tourian’s constant bodyguard, Kossof Gargodian, was sitting in the back of the church certain that there would be no assault upon Tourian in a holy place, on the day before Christmas. However, when the archbishop passed at the end of the procession the fifth row of pews from the rear, he was suddenly surrounded by a group of men in such a fashion as to hide the actions of their companions. Two of the assailants stabbed Tourian with large butcher knives, and once the archbishop fell, the attackers scattered and mixed with the crowd. Two of the assailants were seized by the parishioners, beaten, and subsequently handed over to the police. The police soon apprehended the other seven assailants, who were all ARF members. On July 14, 1934, after a trial that lasted five weeks, two of them, Mateos Leylegian and Nishan Sarkisian, were found guilty of first degree murder, and the other seven of first degree manslaughter. Leylegian and Sarkisian were sentenced to death, but Governor of New YorkHerbert Lehman commuted the death sentences to life imprisonment "on account of most unusual circumstances in this case". The other seven were given prison terms of varying lengths, from 10 to 20 years.
Aftermath
After the killing, American Armenian followers of the Armenian Apostolic Church became split between local churches affiliated with the Catholicosate of All Armenians, located at the time in Soviet Armenia, and those affiliated with the Catholicosate of Cilicia, in Antelias, near Beirut, Lebanon, though the liturgy has stayed the same. Individual congregations became either entirely Dashnak or anti-Dashnak in their membership, with forcible expulsions and violent fights in some instances. For decades to come, Armenians of the Dashnak persuasion would hold the nine Dashnak defendants to be innocent scapegoats and Archbishop Tourian to be a traitor to his nation, while non-Dashnak Armenians would consider the nine suspects and the entire Dashnak party responsible for the crime. At present there are two Armenian church structures in the United States: the Mother See of Holy Etchmiadzin, which is divided into the Eastern and Western Dioceses of the Armenian Church of America; and the Holy See of Cilicia, which is divided into the Eastern and Western Prelacies of the Armenian Apostolic Church of America.