To those who are arguing about the statute of limitations, that only applies to the amount of time between when a crime occurs and when a person is charged for it. If he had fled before being charged, sure, it would be too long. However, as was mentioned, he was not only charged but convicted of his crime. He fled when the judge screwed him over, basically throwing out his plea bargain after he'd pled guilty.

I think he should be arrested, simply because it doesn't promote a good message that you can commit so heinous a crime, flee the country, come back a few decades later (after having enjoyed the world's longest vacation in a country pretty high up on most people's dream vacation spots) and then nothing happen to you. It's important that he be arrested, if for no other reason than to show that being rich enough to leave everything behind and hide out in another country for awhile does not mean you can commit a crime and never go to prison.