Which factor led to the death of Malcolm X in 1965?

Malcom X, being a Muslim himself, was considered a traitor of his people's polictical beliefs and received, on several occasions, many threats agaist him and his house. He was assassinated in February, by members of a Muslim group he used to attend to. But there were other oppinions concerning his death, some believed that the responsable for his death were the local drug dealers.

The factor that caused Malcolm X's death was that there were growing tension between The Nation Of Islam and himself.