O'Loughlin of 'Five-0' on leave for pain medication treatment

Alex O'Loughlin, star of "Hawaii Five-0," will be out for at least one episode so he can be treated for problems with pain medication. Above, Steve McGarrett (O'Loughlin) investigates the murder of a deep sea diver known for his shipwreck finds and his recent recovery of Spanish galleons in an earlier episode of "Hawaii Five-0."