Word Usage: Is "Murder (or Kill) to Death" an UK English thing. I always thought to murder or kill made the "to Death" superfluous.?

Nope, the only time I see  the "to death" thing here in the UK is when it is prefixed with stabbed, shot, et cetera.

Never ever seen killed or murdered "to death". 

If you are killed or murdered you are dead so adding them seems nonsensical.

My guess is they're making a little joke. There was an American comedian who used to say, in a swishy voice, "I'll kill you a thousand times" even though in fact you can only kill someone one time. I've also heard, as an excuse, "I only killed him a little bit." Different people have different senses of humor.

Oh, I just love him to death! But not kill or murder to death.

Not used over here in the south of the US. It's usually more specific like 'he was strangled or bludgeoned to death'. How they are killing them to death.