I never saw the second season because I couldn't stand on my head holding a mile of tin foil to view FOX back then, but I do remember in the commercials for the season two premiere Mason was saying, "Ironhorse and Norton are dead!" I don't know if they were killed offscreen or in just the first episode, but Akin and Paul wouldn't have been in any scenes together.
Ironhorse was killed by two cloned soldiers who were under alien control (as all clones are, in the WOTW-verse). Drake, Akin's character, was killed in the final siege of the humans' original resistance headquarters.
Uh, no...IIRC Ironhorse committed suicide to kill his clone...and I believe his clone had previously killed Drake, but I'm not 100% on that.
This was the first tv show I ever saw to suffer "abrupt change of premise" syndrome. I was always annoyed that we were never given an explanation.
Watched it when I was young enough that some of the content was just...not fun. I even have the novelization of the pilot.