Zaroff is killed by Rainsford.
Humans
... The Zaroff from Doctor Who is a Professor, and does not hold any military rank. However, I suspect you are talking about General Zaroff from "The Most Dangerous Game" (also known as "The Hounds Of Zaroff"), which is a short story and completely unrelated to Doctor Who. Perhaps you put this question in the wrong category?
General Zaroff is a Cossack expatriate (the story is set in 1924) who left Russia when the Tsar fell. He has been a soldier and a hunter, and has built a palatial retreat on a remote Caribbean Island, occupied only by him, his hounds, and a huge deaf-mute servant named Ivan. His only passion in life now is hunting, and he has begun to waylay unfortunate sailors to become his prey.
Cut a long story short
they all died
Zaroff is killed by Rainsford.
In the short story "The Most Dangerous Game" by Richard Connell, General Zaroff meets his demise when he becomes the prey in the "game" he has been playing with Rainsford. Rainsford outwits Zaroff and ends up killing him in self-defense. Ultimately, Zaroff becomes the hunted instead of the hunter.
In the Story Most Dangerous Game General Zaroff Hunts is the Cape Bufflo
Zaroff, Ivan, and one of Zaroff's best dogs
Humans
... The Zaroff from Doctor Who is a Professor, and does not hold any military rank. However, I suspect you are talking about General Zaroff from "The Most Dangerous Game" (also known as "The Hounds Of Zaroff"), which is a short story and completely unrelated to Doctor Who. Perhaps you put this question in the wrong category?
In the short story "The Most Dangerous Game," the huntees are given the option to be set free and allowed to leave the island if they can outrun General Zaroff for three days. If they succeed, they will be spared from being hunted.
Man
The falling action in The Most Dangerous Game is when Rainsford and General Zaroff fight to the death in General Zaroff's room.
In the short story "The Most Dangerous Game," Lazarus is a character who gets killed by General Zaroff while being hunted as part of the deadly game. Zaroff explains that Lazarus "succumbed to the instinct of the hunted" and was unable to outsmart or escape his predator.
The first main character is Sanger Rainsford, a big-game hunter. I suppose the second could be Whitney, but he was not a large character in the story. The next character who is the second main character and antagonist is Zaroff, a famous Russian game hunter.
In the story, 'The Most Dangerous Game', Zaroff's island is also called 'Ship Trap' island. This is the case because Zaroff is responsible for shipwrecking men, so he can later hunt them down as prey.