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

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

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.