or the problem of refugees coming from cuba to florida could decrease as cubans wait to see what will happen in the wake of castro's death. >>shepard: they have been predicting that for decades. thank you from the newsroom. prison officials in oklahoma are ready to execute a convicted killer with a drug used to put down animals. first, the details, he will be put to death, in theory for strangling his cell mate nine years ago. at time he was already serving three life sentences on rape, robbery, and shooting convictions. and this evening, in what many legal experts consider to be a "first," oklahoma will use a chemical in his execution that is the main ingredient in the drug here for dogs, for putting down dogs. officials say the switch was necessary because of a nation-wide shortage of the drug that is part of the lethal