Rick Jones (Secret Empire #1) May 3, 2017
First drawn up in 1962, Rick Jones started life as a rogue teen on the wrong end of a Gamma bomb—he was effectively the man who inadvertently turned Bruce Banner into the Hulk in Incredible Hulk #1. His adventures continued in the pages of Marvel, galvanizing the Avengers into action in Avengers #1—thanks to his Teen Brigade ham radio broadcast—as well as sidekicking for Captain America (as a legacy Bucky Barnes), with the male Captain Marvel, and of course the Hulk. Aside from becoming an honorary Avenger and working for S.H.I.E.L.D., Rick became gamma radiation-powered hero A-Bomb for a time as well.
At the dawn of Captain America's fascist state, Rick was captured for hacking into Hydra computers—using an iPhone, no less. The information he swiped has the power to possibly reverse Cap's transformation and aid the resistance in their fight against the terrorist takeover. Unfortunately, it also cost Jones his life. Despite Cap's waffling, Jones is executed via firing squad in Secret Empire #1, as the first casualty of the event. Rick goes out as the true hero he is, though, yelling "Avengers Assemble" before his death.
Stick (The Defenders) August 18, 2017
Without Stick, there'd be no Daredevil. First introduced in Daredevil during Frank Miller's legendary run, Stick—like Matt Murdock—developed heightened senses in order to compensate for his missing eyesight. Next, he climbed through the ranks of the Chaste, a band of accomplished martial artists, and led the battle against the gang of evil assassins known as The Hand. When young Mr. Murdock was blinded in a freak accident, Stick took him in and showed him how to fight. Later, when Murdock's girlfriend, Elektra, needed help, Stick taught her too.
Stick's story made its way into Netflix's Daredevil series, too—in this version, Stick (played by veteran actor Scott Glenn) trained Elektra when she was a child, and saved her when other members of the Chaste wanted her dead. She returned the favor by killing him.
In The Defenders, Stick enlists Daredevil, Iron Fist, Jessica Jones, and Luke Cage to help defeat The Hand once and for all. It doesn't go well. When Stick learns that Iron Fist plays a crucial role in The Hand's plans, he sets out to kill Danny Rand—but doesn't manage to succeed before Elektra stabs him in the chest, ending his mission prematurely.