The Lone Ranger (1949)

S1E51 The Whimsical Bandit

Dan, the Lone Ranger's nephew, stumbles upon a dead body. The Lone Ranger immediately recognizes him as 'Click' Phillips, the quickest Morse code operator around and a notorious member of Juan Branco's gang. They suspect that 'Click' was in the midst of transmitting a message when he collapsed and ultimately met his end.