The killer most likely does not get any camera time in ep.1 at all. The most likely scenario is that the way too swanky brownstone for an early twenties coked out white girl certainly belongs to someone else.

And that middle aged sugar daddy someone came home to find his estranged sometimes-lover, suicidal, jumpoff bucky naked in bed....He lost his shit... and killed her.

All the while Naz is downstairs in the kitchen after he tried to get some water to hydrate but passed the fuckout at the kitchen table.

Killer never even enters the kitchen to know there's a sloppy drunk/high Pakistani kid to worry about..