I know that this is a duplicate of MC-26198 but I have no mods or third party editors.
I killed a zombie and he was dead but his sound continue/finished after it was dead. I don't think this is a huge issue but it is all for the better of the game.
Comments 4
What this report basically means is that the mob sound that is playing when it is being killed is not stopping, but continuing, although the mob is not there anymore.
Confirmed for 1.8.4, though not sure if this can be fixed (at least with the current sound engine), as there is no way to stop a sound midway (unless you press ESC, which comes with bugs such as MC-35714).
I believe that this is an intended feature. Would you rather have it abruptly cut off when they die? Creatures don't suddenly stop making noise when they're about to die.