He would never do that, he’s too narcissistic. Let the copious amounts of Filet o Fish and lack of vegetables do him in. I’m sure that would be a lot more painful and miserable than an instant gunshot.

I think the dark part is that the punchline is a man who killed himself on live television

The difference is that Dwyer did it on live television, in a highly publicized press statement. Cameras didn't cut away.

He was a politician who was caught having accepted a bribe, basically, which seems bizarrely mundane today.He said something to the effect of "Don't look, this will affect you" before he did it, too... petty self-aware for someone who's about to kill themselves in front of a crowd.

Edit: The wikipedia article actually has it in there.

After he had finished speaking and handing out the notes to his staffers, Dwyer grabbed a manila envelope and drew a Model 19 .357 Magnum revolver from it, causing others to panic. Dwyer backed up against the wall, holding the weapon close to his body, and said, "Please, please leave the room if this will — if this will affect you."

[...]

Several people in the room pleaded with Dwyer to surrender the gun or tried to approach him and seize the weapon. Dwyer warned against either action, saying as his last words: "This will hurt someone". Dwyer then killed himself with a single shot through the roof of the mouth. His death was recorded by at least five running news cameras.

Wikipedia editors man, going to the finest of details

Upper wall or lower wall?