A relative of mine was a corrections officer at a very rough prison. He worked nights and said it was usually a very quiet and easy job overall.
One night, he's making his rounds and this house-size prisoner
(henceforth referred to as "House") tells him to check on another
prisoner because it sounds like he's choking.
He goes to check on the cell and there's no one in it. He goes down
and tells House that it's empty, everyone else seems ok, and he must be
This goes on night after night and my relative is thinking House is
just fucking with him. So, he tells House to shut up and go to sleep.
House says he can't sleep.
One night, House is freaking out. My relative goes over and House has
terror in his eyes. That's when my relative hears the choking noise.
Then a couple other inmates start asking "what the fuck was that?"
House looks like he hasn't slept in a month and despite being at least
350 pounds of meat and potatoes, this guy looks like a scared
kindergartener. My relative said he heard the noise for a solid 5
minutes, clear as day. He went around, but just couldn't hear where it
was coming from because "it was like it was coming from everywhere."
When my relative reproduced the choking noise, it sounded like one of the zombies from The Walking Dead.
He said they never found a physical source for the noise, but after
talking to other guards, he discovered that an inmate had been strangled
to death in the empty cell years earlier: Apparently, while being
strangled, someone stabbed the inmate in the throat below the rope and
he was gurgle-choking-drowning through the throat stab wound. So, they
beat him to death instead.