the military commander wasn't killing, but rather redirecting either the Mafia blocker or the killer towards Alex.
If this is true, there's another valuable conclusion for our esteemed investigator (in case he hasn't figured it out yet): you weren't redirected that night, so the result of your investigation is genuine. I really hope you can somehow subtly convey this to the city's public. Just don't reveal yourself openly, we still need you!