The wee beasties can certainly be vicious but the problem I see would be that a typical cat can’t deliver a killing bite to the throat. I’m thinking of the scene in Jurassic Park where Wayne Knight is attacked by a bunch of little dinos in his jeep. Lots of thrashing around and blood flying. “Fluffy - stop it! Arghhh…”
I’m worried now. 
“No, you’re fine, human. Rrroouuugh…
That vaguely sounds like my evil Siamese cat Bear. His sister, Meeko would never kill, she’d join the buffet, tho’!
Sadie could do it with cuteness overload.
Need answer fast?
Nitpick: this was only one dino. Your memory is playing tricks on you. Here’s the scene.
Yes, one, because cats are very intelligent. When they walk back and forth between your legs, it isn’t an act of affection. They are timing out what they are going to do when you are at the top step. 
I didn’t know about that incident, but I was going to say that cat bites in general tend to be much more infectious than dog bites. I’ve had a few dog nips that required nothing more than a bit of Polysporin and a bandaid.
One if you try to swallow it whole.
I’m so ashamed I posted this…
I’m so proud of you!
One is all you need, if you trip over the little bugger as it insists on getting between your legs, and you trip and fall and break your neck.
I would like to be killed by the highest number of kitty cats possible.
I imagine being tossed into a grain elevator filled with cats would not end well.
Leaving aside the terror sometimes called “Trippin’ Kitty” in my house, I’m thinking 3, 4 tops if they want to kill you by hyperthermia.
One cat curled up on you is warm. Two cats curled up on/against you is is uncomfortable warm (for me), figure one or two more will bake you with their BTUs and then, after the nap, they get to have a hot meal!
Upon reading the thread title I immediately remembered a Twilight Zone-style show I saw in the early 80s where a young guy was killed by a house cat, and in the closing scene his mom is downstairs calling his name, and when he doesn’t answer, she says “What’s the matter, cat got your tongue?”…zoom in to the cat munching away on tasty tongue.
So I just spent the past ten minutes or so trying to find out what show that was.
It was a show called “The Darkroom” that only had 7 episodes. That particular one, “The Partnership / Daisies / Catnip” apparently aired on Christmas night of 1981. In it, a young guy killed an old woman rumored to be a witch in a hit-and-run, and he is stalked by her pet black cat–the one who got his tongue.
Wow, what a weird show to remember 44 years later because of a thread title.
It won’t kill you, but a couple of zoomy kittens running up your bare legs as if you were a tree is an exhilarating experience.
When I was a young thing, I was able to experience this phenomenon courtesy of the neighbor’s pet raccoon.
What about a Mole of cats?