Law & Order: Criminal Intent S06E05 - Bedfellows

The Copeland brothers are nothing alike -- Adlai is successful and a true gentleman while Ted is irresponsible and difficult. So when Detectives Goren and Eames find a poisoned Adlai with his wife still clinging to his corpse, they suspect it wasn't an accident. But when Ted also turns up dead after the Detectives find he forged documents, they begin to take a closer look inside the family.