He obviously wasn’t RED.
Only in the movies does the hero always win.
Based on what I've read so far, both Mr. Wheeler and his wife were employed one time or another as field intelligence. His wife appears to have been a 'spy' since she was 20 years old.
That may have something to do with his death, and it may not.
I seriously doubt that the public will ever 'know' what really happened. It wouldn't be the first time.