Decapitation as in the final result of the suspect…or our own risk of it?

You’re forgetting the possibility of a decapitated corpse.

Fine. Decapitated suspect: possibly. Haven’t checked up on them. Would have to call Lestrade on that one. Our risk: Never. Decapitated corpse: Yes. Three, I believe. The one that sticks out to be was Jeffery Garmeth. Someone had sliced off his head. Sherlock deduced it to be his step-mother.

Oh, that one was interesting.

Only because you broke into Garmeth’s flat with our key.