Due to a glitch in LMD Coulson’s matrix as he’s rebooting from the EMP, Agents of SHIELD goes full on black and white film noir in episode 4. The team is still in 1955, dealing with Daniel Sousa and the aftermath of the destruction of Helius Project.
Sousa quickly moves on to his next assignment, transporting an artifact to Howard Stark in Los Angeles. But according to history, this was his last assignment. Once he turned the artifact over to Stark, he was murdered, becoming the first official SHIELD agent to die in the line of duty on US soil (still not letting you erase Bucky Barnes, MCU), and inspiring generations of SHIELD agents with his dedication to duty.
The history books forgot to mention that Hydra and the Chronicoms were competing to see who could get to Sousa first.
Or that there was a ragtag team of dogooders from the future trying to keep him alive.