George Stacy

Death
Towards the end of the first Sinister Six incident, Electro, Sandman, and Kraven caused a scene in downtown New York near Oscorp's corporate headquarters. Spider-Man and the police, lead by Captain George Stacy and Detective Jean De Wolff, went to intervene. The going was tough, but when Electro was grazed by a police bullet he discharged a large amount of electricity, taking down Sandman and Kraven. But they realized it was just a diversion--the electricity caused a shortage in a hidden machine nearby, which uncloaked a hideous contraption on top of the Oscorp HQ. Constructed by Octavius and Toomes and kept hidden from plain sight by Beck was a gigantic Matter Diffuser set to annihilate the headquarters, the remaining three of them finishing the final phase of its development on the roof.

Spider-Man left to intervene and battled with the remaining three. The machine was irreparably harmed in the chaos, and, rather than see his invention fall into the hands of his enemies, Octavius smashed it and sends it hurtling off the rooftop, in an attempt to kill some innocents in the process. Spider-Man wasn't able to reach the ground in time, but Captain Stacy managed to get everyone out of the way before the machine crushed him. Octavius was finally captured, though Toomes and Beck managed to flee. When Spider-Man reached Captain Stacy, he found that the Captain was in the last moments of his life. With his final breath, Stacy implicitly revealed to Peter that he knew who he was, and that he needed to protect Gwen. The death of Captain Stacy would drive a wedge between Peter and Gwen.

Design
"Design wise he's pretty much just his Spectacular counterpart but with darker hair. I felt that, if he's not going to be the old, retired figure he was from the mainstream comics he shouldn't look so dang old." - GM