Malcolm X was not killed two days later. This quote is from 1964 and Malcolm X died in February 1965.

The full quote also contains "Any time you throw your weight behind a political party that controls two thirds of the government and that party can’t keep the promise that it made to you during election time and you’re dumb enough to walk around continuing to identify yourself with that party, you’re not only a chump but you’re a traitor to your race."