Law & Order: Criminal Intent: Cruise to Nowhere

When a High stakes gambler's body is found in Hudson River, Detectives Goren and Earns suspect a much younger, but equally accomplished gambler who was owed $500,000 from the deceased. Turns out the High stakes gambler was also a former school chancellor, and not only would the much younger gambler have a reason to kill him, so would his resentful brother in Law. After some investigation, Detectives find out that the brother in law not only raised and taught Joey poker, he also saw to it that he was on a particular casino boat that night.