This is why I'm now against the death penalty here in the U.S.. It makes extradition from places like Mexico (and other countries that don't have the death penalty on the table) so much harder. It's also why people like these two murdering cretins flee there. They're likely already there by now. Great.
Have the charges against them been formally announced? It might be 2nd degree murder, for which there is no death penalty in WA - it is only for 1st degree aggravated homicide -- there is a temporary (during his term) moratorium on death sentences by the current Governor.