The first time the Joker is tried for murder, he is found Not Guilty by Reason of Mental Disease or Defect. The state legislature greatly tightens the legal definition as a result. The second time the Joker is tried for murder, he is convicted and executed.
On afterthought, that’s not really in keeping with the thread’s premise…
A would-be master criminal known as the Red Hood dives into a vat of chemicals in an effort to escape arrest. He dies.
Alternatively:
Wanna know how I got rid of those scars with Mederma?
A building falls down during an earthquake in Egypt, crushing an American photographer and his African wife of undetermined nationality*; their child Ororo survives and is sent to live with her maternal grandmother in St. Louis.
He didn’t take on BP? Useless bastard. 
Is that her current origin story? I wonder if they changed it to reflect the films :rolleyes: I seem to remember a Storm who was worshipped as a goddess and lived in Africa as an adult where she was recruited by Xavier.
The infant Kal-El lands in Kansas, carrying Kryptonian bacteria that wipes out all life on Earth, leaving him to grow up alone as a feral child on a barren world.
In 1959, physicist Jon Osterman is reported to have been accidentally trapped in a time-locked test vault during an experiment and completely disintegrated. In the following months, eye witnesses attested to bizarre phenomena in and around the Gila Flats facility where the accident occurred, culminating in Osterman’s reappearance, now with god-like powers.
In the subsequent investigation, Osterman admitted that the entire sequence of events was a prank that “got way out of hand” and stated to police that he “never thought people would be so gullible”. He and his accomplice, Wallace “Wally” Weaver, are charged with falsifying police records and conspiracy. Both were dismissed from their positions. Osterman eventually found work as a high school physics teacher in Tuscon, Arizona and died in 1987.
Jor-el’s experimental rocket ship’s engine fails, causing it to fall back to Krypton and trigger the final catastrophe.
Kryptonian scientist Jor-El determines his planet is doomed and decides to save his only son by placing him in a small spaceship with a course plotted for the planet Earth. Inexplicably, he completely fails to consider the immense distances involved, thereby sentencing his infant son to death decades before the craft enters the Solar System. The point is moot as Krypton is, indeed, destroyed.
No, that’s a job for Captain Hindsight
After witnessing the murder of his parents at the age of 8, Bruce Wayne grew up to use his considerable wealth to lobby for tighter gun control in Gotham city.
Being a rich idiot with no survival training, Oliver Queen starved to death shortly after becoming shipwrecked on a dessert island.
After being doused in hazardous chemicals that fell from a truck, Matt Murddock won millions of dollars in a law suit against the trucking company. He uses his riches to fight crime as Batman.
The Waynes had a lovely evening out, taking their son to see “The Mask of Zorro,” but when they decided to go out for an ice cream afterwards (instead of cutting through Crime Alley to get to their car), the shop was out of vanilla. This gave Bruce story material for years, and explained why he founded the Happybat Creameries ice cream parlour chain, with their corporate promise to never allow a child to be without their favorite flavor and perky winged mascot.
You started in Chapter 3.
Her parents met in the US; the mother was an African princess (no further details given), the father American. They were living in Egypt when an earthquake dropped their house on the parents, leaving little Ororo Munroe orphaned to be taken up by the Thieves’ Guild, eventually coming to the attention of the man who would later become the Shadow King. Shortly before her menses started (of course the writers aren’t as uncouth as to mention such a thing), she headed south at the urging of her mentor (during this trip, she met and travelled with the boy who’d later become the Black Panther); eventually she came to the area where she became worshipped as a goddess, which is where Chuck picked her up.
Chick doesn’t have a background story, she’s got a background Delia Fiallo soap opera.
Traumatized by the brutal murders of his parents, young Bruce Wayne vows to use their considerable fortune to remake himself as a crime-fighting costumed vigilante. After years of preparation and training, he is fatally shot while confronting an armed robber. (Public reaction in Gotham City is a mixture of horror and amusement that one of the city’s most prominent citizens was killed while dressed as a giant crime-fighting “bat man”.)
Quibble: you messed up his origin.
Ralph was fascinated with “India Rubber-Men” and found out that < gosh! > all of them drank “Gingold” flavored soda. He made a super-concentrated extract of gingold and got elastic powers.
I’d suggest that he drank his super concentrated gingold extract and had diarrhea for 4 days.
John Clayton, Lord Greystoke and his wife are marooned by pirates on a desolate African coast. Lady Greystoke dies giving birth to a still born child.
Cliff Steele is badly injured in an auto accident. Doctors try to put his brain in a robot body, but the technology isn’t up to it and he dies.
Larry Trainor is exposed to radiation while piloting his jet in the atmosphere. It gives him the ability to change into a being of pure energy. While testing out his powers, he decides to see how long he can remain in this form. After 61 seconds, the discovers to his dismay that it’s only a minute.
Rita Farr is overcome by volcanic fumes and asphyxiated.
Niles Calder hears about the three, and feels responsible for Cliff’s death and, despondent, commits suicide.
They are later referred to at the Doomed Patrol.
Jay Garrick is overcome by fumes from hard water, the sulfur in them miraculously clearing his post-nasal drip.
Chlorophyll Kid falls into the vat of fertilizer. He earns the nickname “Stinky” which haunts him through his teen-age years.
Bob Frank (The Whizzer) is given a transfusion of mongoose blood. Not a radioactive mongoose, or a space-mongoose. Just…a mongoose. Anyway, rather than getting super speed, he dies, horribly, from hemolytic shock.
After a man named Steve Trevor lands on the island of Themyscira, inhabited by the Amazons of Greek legend, the Amazon Diana is chosen to bring him back to “the world of men” and to serve as ambassador there. Upon arrival she discovers that men are actually kind of cute and they have indoor plumbing and decides to immigrate permanently. She ends up married to a fellow immigrant, a reporter fellow from Krypton after a tragic incident involving Steve Trevor that led author Larry Niven to write an amusing article titled Woman of Steel, Man of Kleenex.
Steve Austin survives a secret military prototype plane crash. He is horribly disfigured but slowly learns to live with it. He leaves the military to campaign for disabled rights but is unable to talk about his own injuries due to the official secrets act. Years later he sees an incredible operation on TV where a woman gains bionic implants, if only he had been born earlier he muses.
Edited for typo.