In The Sign of Three Sherlock said Billy Kincaid the best man he ever knew. Following was his quote about Billy
Billy Kincaid, the Camden Garrotter, best man I ever knew. Vast contributions to charity, never disclosed. Personally managed to save three hospitals from closure and ran the best and safest children's homes in north England. Yes, every now and again there'd be some garrotings, but stacking up the lives saved against the garrotings, on balance I'd say he...
Now I find out that Billy Kincaid is a villain in comics. Now I know creators of Sherlock do not throw any dialogue without any reference.
So is there any connection with comic villain or it's another character from London History or any of original Sherlock Holmes character?