Perry Mason

The Case of the Wary Wildcatter (3x16)

:

Charles Houston cleverly get away with killing his wife by making it look like she died in a car accident. Then a wildlife photographer shows up with the murder on film and Charles discovers that his sister-in-law has squandered all the profits from his oil well. The situation then goes from awful to good grief when the sister-in-law is found locked in a room with Houston's corpse.