Imagine in the beginning of Civil War Steve is in his apartment, rolling up the cuffs on his suit, adjusting his tie in the mirror, and picking up a small music box off his nightstand as he sits down on the edge of his bed. He carefully opens the top, a gentle melody (like this) plays as a ballerina slowly spins in a circle. A flashback reveals Peggy had given it to him one of the last times he visited her, it had belonged to her since she was a little girl. Natasha knocks on his door then telling him it’s time for the funeral. The lid snaps shut abruptly stopping the music as a single tear lands on the top.
Flash forward to Infinity War and Steve has been deserumed (“is it permanent? So far..”) Bucky and the team tell him to stay behind, that he’d only get hurt now. Hydra agents invade avengers tower while the other Avengers are out on a mission, Steve nearly is killed and would have been if Bucky had not decided to come back and stay at the last minute, but it doesn’t stop Steve from having a Asthma attack and needing to be hospitalized.
At the end, Bucky and the other avengers have no choice but to leave Steve in the hospital while they fight a battle. As the fight goes on the scene switches to Steve lying in his hospital bed, a familiar music box on the table beside him. His heart rate monitor flatlines. As the nurses rush around him the doctor knocks the music box off the table and it crashes to the floor, the top opening and the melody beginning. Switching between slow motion scenes of the Avengers battling and the nurses trying to restart Steve’s heart, no sound but the gentle melody. Finally the doctor frowns and shakes his head. Steve is gone. A close up of Steve’s eyes as a nurse closes them and pulls the sheet over his face in a parallel to his eyes opening in the first avenger. A nurse stops Bucky in the hallway, his face pales and he pushes past her and rushes into Steve’s room. He starts to pull back the sheet but stops himself and sinks against the wall instead, head in his hands crying. The little ballerina slowly coming to a stop as the melody ends.
Steve dies not on the battlefield, but in a hospital bed. A ordinary death, not that of a hero and icon, there is no heroic moment of self sacrifice in which he gives his life.
He died, not as Captain America, but simply as Steve Rogers, just a kid from Brooklyn.