As I pointed out in Ken's defense, most real life deaths pretty much do happen like that. The victim may suffer nobly or ignobly, or not at all, but when the moment comes, the average person will flop, maybe twitch a little, then they die. The average death wouldn't make the cut on screen or in fiction. That's good, because fictional deaths tend to be bizarre and painful.
One reason for that is because the characters most likely to die are villains. They deserve to die, after all, and die they do . . . in droves. I've seen a fair share of real-life deaths, a couple of them gruesome, and none would be too gruesome for a fictional villain. The crowd at a Roman circus would be less bloodthirsty than readers determined to see a villain meet a bad end.
For a writer, there are few moments more satisfying than killing off a good villain. My best literally disintegrates the guy, though I'm also proud of the man who's magically turned into a stag, brought down by his own dogs, and gets his throat cut by his best friend. I killed Lorant in Captive Hearts with a rock precisely because being killed by a rock is pathetic, besides which Gaspar was not exactly famed for his prowess as a warrior, hence the rock. Another of my villains, Lukacz of Dangerous Beauty, died off-stage . . . but only because none of my POV characters were present at the event, which occurs in full and bloody detail in the opening chapter of a sequel.
Heroes and heroines, on the other hand, tend to die handsomely. If their deaths are bloody, they're also noble or, better yet, tragic, because readers expect a worthwhile reward in return for the beloved character's suffering. I'm proudest of the way I kill off one of my favorite characters in a book soon to be published: he suffers greatly at my hands, but he pretty much saves the world. It doesn't get much better than that. I cry every time.
In fiction of any kind, a truly satisfying death is seldom passive. That's where Ken's death scene failed. He didn't flail, or rage, or get in a good blow. He just flopped down and died. Anyone can do that.