Black Noir turned out to be an unstable clone of the Homelander. His main purpose? To kill Homelander once he goes out of line. The problem was Homelander didn’t do anything extremely appalling, and Black Noir started to get impatient. So Black Noir did a couple of heinous crimes, and then took pictures of it, framing Homelander. The latter then started to think he was delusional since he had no memories of those crimes being committed. As Billy Butcher put it succinctly:
“It means you turned into a fuckin psychopath by mistake.”
It all came to a boil when Homelander launched a coup on the United States government along with other superheroes. Black Noir confronted him inside the Oval Office and killed him by punching Homelander’s jaw off, and then tearing his body into pieces.
From – The Boys #65