Answer
Judah Rosenthal, played by Martin Landau, is a prominent ophthalmologist and friend of the protagonist, Judah Lefkowitz, in Woody Allen's "Crimes and Misdemeanors." Rosenthal becomes entangled in a moral dilemma when he learns of Lefkowitz's affair and subsequent murder of his mistress. Despite his initial shock and disapproval, Rosenthal ultimately chooses to protect his friend and conceal the crime, leading to a profound crisis of conscience.