Detroit Become Human Bad / Worst Ending (Everyone Dies).

For this ending you have to lose all characters as early as possible.
Here's the order in which they can die:

1) Kara & Alice - Chapter: On the Run
2) Markus - Chapter: Freedom March
3) Hank - Chapter: Night of the Soul (him and Connor must be hostile)
4) Connor - Chapter: Battle for Detroit

This is also the shortes playthrough possible (because it will skip a lot of chapters when someone is removed from the game). A normal playthrough is 10 hours but if you lose everyone at the earliest opportunity it only takes around 6 hours.