Courtesy of HBOSaving the worst for last, Ramsay Bolton is arguably the vilest, creepiest character of all time. His love of watching others suffer seemed to know no bounds.
The good/bad news: the former evil Lord of Winterfell met his demise, so the courts can’t punish him. Had he survived, Ramsay would be facing charges for kidnapping, torture, animal cruelty, baby murder and rape.
In California, being married to someone does not equal consent. So his horrific wedding night with Sansa in “Unbowed, Unbent, Unbroken” would be considered a felony. His capture of Theon Greyjoy would put him on the hook for aggravated kidnapping, — since he caused him severe bodily harm as well — which comes with a potential life sentence, as does the aforementioned first degree murder.
However, the insanity defense still exists in California and Ramsay could have served his time in a state mental hospital instead of a prison. 

Source: Hollywood Reporter – Top Story