Check out the following link for Black Lantern candidates (from
Green Lantern #43)
https://media.insidepulse.com/zones/comicsnexus/uploads/2009/07/gl_43_p12-13-1-copy.jpg
Tula (aka
Aquagirl I) died during
Crisis On Infinite Earths when she drowns in the water that was poisoned by Chemo. Reappears as a Black Lantern in
Blackest Night #2
Al Pratt (aka
Atom I of the Justice Society) murdered during
Zero Hour by the villain Extant.
Sue Dibney (wife of Ralph "Elongated Man" Dibney) murdered by Jean Loring, wife of Ray "The Atom II" Palmer, during
Identity Crisis. Reappears as a Black Lantern in
Blackest Night #1.
Ronnie Raymond (aka
Firestorm of the JLA) died during
Identity Crisis. Reappears as a Black Lantern in
Blackest Night #2.
Digger Harkness (aka
Captain Boomerang of the Flash's Rogues Gallery) died during Identity Crisis when, simultaneously, he and Jack Drake, father of Tim "Robin/Red Robin" Drake, killed eachother.
Ted Kord (aka
Blue Beetle II of the JLA/JLI) murdered by Maxwell Lord during
Countdown To Infinite Crisis.
Maxwell Lord neck snapped by Wonder Woman in defense of Superman and Batman in
Countdown To Infinite Crisis.
Ryan Kendall (aka
Black Condor II of the Freedom Fighters) killed by Sinestro during an ambush on the Freedom Fighters by the Secret Society of Super Villains in
Infinite Crisis #1.
Dee Tyler (aka
Phantom Lady II of the Freedom Fighters) wounded by Cheetah and killed by Deathstroke during an ambush on the Freedom Fighters by the Secret Society of Super Villains in
Infinite Crisis #1.
Roy Lincoln (aka the
Human Bomb of the Freedom Fighters) beaten to death by Bizarro during an ambush on the Freedom Fighters by the Secret Society of Super Villains in
Infinite Crisis #1.
Roger Hayden (aka
Psycho Pirate II) killed by Black Adam when his eyes are gouged and his mask his pushed through his skull during
Infinite Crisis. His body is currently entombed beneath the JLA's Hall of Justice. Solicitations indicate he will be returning as a Black Lantern during the
Blackest Night: Superman limited series.
Vic Sage (aka
The Question I) dies of lung cancer during the
52 limited series.
Ralph Dibney (aka the
Elongated Man) killed by Neron during the
52 limited series.
Jean Loring (estranged wife of Ray "Atom II" Palmer and former host of Eclipso) dies after being struck by a lightning bolt during battle with Mary Marvel during
Countdown To Infinite Crisis and falls into the ocean below where she drowns.
Arthur Light (aka
Dr. Light III) burned to death by The Spectre in
Final Crisis: Revelations #1.
J'onn J'onzz (aka
Martian Manhunter) murdered by Libra in
Final Crisis #1. Returns as a Black Lantern in
Green Lantern #44.
Boston Brand (aka
Deadman) remains the heroic ghost and is assisting Batman & Robin while his deceased body is resurected as a Black Lantern in both
Blackest Night #2 and
Blackest Night: Batman #1.
Terra Markov (
Terra of the Teen Titans) while attempting to kill Deathstroke after she went insane she accidently killed herself in the process. Her short heroic tenure, betrayal, and death were all featured within the pages of
The New Teen Titans.
Wesley Dodds (aka
Sandman I of the Justice Society) committed suicide in order to prevent the villainous Mordru from reading his thoughts and to protect Dr. Fate in
JSA Secret Files & Origins #1.
Jenny-Lynn Hayden (aka
Jade of the Outsiders and Green Lantern Corps, the daughter of Green Lantern Alan Scott, & lover of Green Lantern Kyle Rayner) died trying to stop Alexander Luthor in the
Rann-Thanagar War: Infinite Crisis Special. Returns as a Black Lantern in
Green Lantern Corps #39.
Arthur Curry (aka
Aquaman, Orin, Dweller of the Depths) murdered while attempting to help his successor. Returns as a Black Lantern in
Blackest Night #2.
Jonathan Kent (adoptive father of Clark Kent) died of a heart attack during the "Braniac" story arc in
Action Comics. His casket is dug up by the Black Lantern Earth-2 Superman in
Blackest Night: Superman #1.
Bruce Wayne (aka
Batman I) "killed" by Darkseid's omega sanction in
Final Crisis #6. His skull is stolen from his grave by Black Hand in
Blackest Night #0 and is shown in his possession in all solicitations following.
More coming...