noun
occupant
AHK-yuh-puhnt/ˈɑːkjəpənt/
A person living in or using a place or vehicle.
The apartment's occupant opens the door, revealing the lived-in room.

Etymology
The image of seizing something became that of taking and holding possession. An occupant originally took possession of ownerless property; the modern sense focuses on living in or using a place.
In context
murphy is the only remaining occupant in the room he stands again and begins slowly walking backwards towards the emergency exit
More examples
- The apartment's previous occupant left a forwarding address.
- All building occupants must leave during a fire drill.
- The driver was the truck's only occupant.
Forms
occupant · occupants
occupy verb — To live in or use a place.
occupancy noun — The state of occupying a place.