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Seconds after Brandon Volpi was slashed in the throat and stabbed in the heart on his prom night, he clutched his bleeding neck and shouted angrily, “Who did this? Who did this?”

The St. Patrick’s High School grad’s dying words were revealed at his accused killer’s trial on Thursday when Les Suites Hotel security guard Brandon Armstrong took the stand and recounted the bloody morning of June 7, 2014.

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Armstrong, 24, testified that he walked outside the hotel’s main entrance after he was radioed by another security guard reporting a brawl and looking for back up.

It was chaotic, and drunk high school grads were screaming, he told court.

It was Armstrong who applied pressure to Volpi’s neck and later administered CPR.

“He was holding the left side of his neck. He was pretty confused and angry, shouting (to his friends), ‘Who did this? Who did this?’ He seemed confused and agitated,” Armstrong testified at the second-degree murder trial of Devontay Hackett, 21.