How many people are in line for the president if the president gets killed?

The line of succession if the President of the United States is no longer able to serve or is killed is the following:

1. The Vice President of the United States.

2. The Speaker of the House of Representatives.

3. President pro tempore of the Senate.

4. The Secretary of State

After the Secretary of State, the succession goes through the Cabinet in order they gained position however, if there's a non-natural born citizen within the Cabinet, the succession will pass through them and on to the next in line.