Past

Lady Blackhawk -shot by Steve Trevor

Artemis (Amazonian) -killed by Black Adam

Black Condor -killed by Firebrand

Dollman -killed by Firebrand

Human Bomb -blew himself up

Firebrand -blown up by Human Bomb

Major Disaster -blown up by Human Bomb

Mordru -turned to stone

Ted Knight -shot by KGBeast to save his son

Eliot Taylor -shot in the head by Sgt. Rock

Medusa (CCs) -shot in the head by Sgt. Rock

Hawkman (Carter Hall) -killed by Captain Nazi

T.O. Morrow -shot by Steve Trevor

Adolf Hitler -killed himself

Sardath -killed by Thanagarians

Alanna Strange -killed by Shayera Hol

Modern Era

Thomas and Martha Wayne -shot by Joe Chill

Queen Atlanna -killed by an Atlantian soldier 

Nora Allen -dead in a freak accident. Husband accused of murder

Malcolm Merlin -hanged to death

Onyx Adams -hanged to death 

Lionel Luthor -by Parasite

Johnathan Kent -heart attack

Wildcat -killed fighting Bane

Barbara Gordon (Wife of Jim) -killed by mobster

Toyman -revealed to actually be Brainiac

Carmine Falcone -killed himself from insanity

Salvator Maroni -killed himself from insanity

Abin Sur -blown up by his ship

Green Man -killed by Sinestro

Fisherman -killed by Aquaman

General Zod -killed by Lex Luther

Faora -killed by Lex Luther

Non -killed by Lex Luther

Shazam the Wizard -faded away

Black Adam -withered to dust

Flying Graysons -fell and burned from the trapeze 

Victoria Kord -killed by Carapax

Carapax -kills himself

Javelin -shot by Cupid

Cupid -shot by Green Arrow

Vulko -killed by Black Manta

Cinderblock -destroyed by Silver Banshee

Hat -killed by Manchester Black

Commissioner Lobe -poisoned by Riddler

Maria Bertinelli -killed by Killer Croc

Bloody Mary -shot out an airlock into space

Mad Harriet -shot out an airlock into space

Ugly -killed by Kalibak

Whisper -killed by Kalibak

Elinore Stone -killed by Parademon

Mia Saunders -SIDs

Adam Strange -fell into the Earth

Shayera Hol -shot by Adam Strange

Enza Nelson -killed by Joker

Roland Daggett -killed by Clayface

Mirror Master -destroyed by fusion reactor

Weather Wizard -destroyed by fusion reactor

"EARTH 2" -destroyed by Ani-Monitor  

Marie Logan -sacrificed herself

Monsieur Mallah -sacrificed himself

Future

Appalaxians -dismantled and separated

Triplicate Girl -all killed by Persuader

Mano -disintegrated after contacting Eye of Ekron

Persuader -killed by Lightning Lad