A Jewish man who was shot and killed on Tuesday by Israeli troops who suspected that he was a terrorist left a suicide note declaring that he suffered from mental distress.

Police said the 19-year-old from the northern Jerusalem neighborhood of Pisgat Ze’ev ran at a female soldier on Tuesday afternoon, knife in hand, at the Hizme checkpoint in the West Bank, close to his home. After he was shouted a warning to halt, a security officer at the scene opened fire, killing him.

Hours after the incident, a friend of the suspect gave the suicide note to police, saying the dead man entrusted it to him several days before, according to Hebrew media reports.

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Channel 2 News said the letter was addressed to the man’s mother, apologizing in advance and saying this was his last communication. He reportedly wrote that he could no longer lead a normal life in his mental state, and had no reason to continue living.

Since the wave of Palestinian terrorism broke out in 2015, over half a dozen Palestinian attackers suffered from mental illness or sought to end their lives in a form of “suicide by cop” or “suicide by soldier.” However, Tuesday’s case appeared to be the first such incident by a Jewish assailant.

A police statement on Tuesday said security forces had acted according to regulations by firing when they felt they were in immediate danger.