Murder Or Self-defence?

Person gets out of a car, or leaves their house, with a loaded gun. There was a stated intent to go after someone who looked "suspicious".
Is it self-defence or murder if the person who "looked suspicious" is killed?
To make it fun, let's use this statute!

Feel free to use this guide to help you come up with something vaguely intelligent should you wish to answer this: open.lib.umn.edu/criminallaw/chapter/4-2-criminal-intent/
BTW, this uses two situations where get away with murder laws were used.  Extra credit for guessing which two situations I am thinking of and their outcomes!