What character deaths upset you the most?

[Dr. Skeleton]

Character deaths in comics have become a pretty common thing now. A character gets killed either to boost sales or it more or less made sense depending on the storyline or just because. A character would come back in a matter of either a few months to 10 years. What characters that you loved who were killed off made you so upset that it made you write a nasty letter to the company or just gave up on the comics? Here are a list of mine and let me know your list.

Colossus
Iron Man
Nick Fury
Batman
Rapture (from Savage Dragon)
Betty Ross
Capt. America
Elongated Man

[Neil Kapit]

I think we need to differentiate between "upset because it was an emotionally moving story" and "upset because it was a cheap shock ploy". For the former category, I have;

Jean Grey (first time)
Damian Wayne
Ultimate Peter Parker
4/5ths of The Boys (interpret that as you will, because I don't want to spoil it)
Rorschach
Marko's father in Saga
Henry in American Vampire
Superman in All-Star Superman
Gertrude Yorkes
Gwen Stacy
Roger the Homunculus
Agent 355
Tony the Cat in The Filth
Mr. Hyde in the League of Extraordinary Gentleman (sort of)
Magneto in Planet X (sort of)
The High (Stormwatch)

And the latter, sucky category features;

Martian Manhunter (Final Crisis)
Colossus (Scott Lobdell's second Uncanny run)
Nightcrawler (X-Men: Second Coming)
Ant-Man, Vision, and Hawkeye (Avengers Disassembled)
Corsair (Brubaker's X-Men)
Sue Dibny
Iron Man (the Crossing)
Everyone who died in Ultimatum
Everyone who died in Ultimate Cataclysm
Giles (Buffy Season 8)
Cyclops (X-Men: The Shattering)
The Doctor in Authority: Revolution
The Wasp (Secret Invasion)
Stature (Avengers: The Children's Crusade)

[KurtW95]

Whenever it's a character I like. So basically, all of them except Famtomex.

[Dr. Skeleton]

Martian Manhunter (Final Crisis)

Forgot about MM. His death was rather ridiculous and vague at first and then was clarified later on. DC were at the point where they were following Marvel's footsteps to kill characters to sell a few books.

[Lady Warp Spasm]

Well I was super pissed at the fake Bucky death in Fear Itself more for the fact how utterly dumb it was and that Ed did not write that fake out. After that, I stopped caring about deaths.

[coveredinbees]

Jean's death in Morrison's run. We just saw her come back to life! And she was rapidly becoming Morrison's most well written X-Man.

[Bradley]

I would say probably Blue Beetle's. Not just because I really liked the character (although I did), but because it seemed like they killed one character and ruined another (Maxwell Lord) in an effort to prove that superhero comics could be "serious" and "mature"-- as if grown-up entertainment is all about shocking acts of violence. I've picked up the occasional DC book since then, but that was when I realized that I probably wasn't part of DC's target audience anymore.

[Choos]

Jean's death in Morrison's run. We just saw her come back to life! And she was rapidly becoming Morrison's most well written X-Man.

Yes absolutely WTH happened to kill Jean, this was the only time I felt disgusted with Marvel and stopped reading comics from Marvel altogether.