David Edwin Mason. Executed in the notorious “Coughing Box”. Here’s why.
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Sources:
California Executed Inmates
Executed Inmate Summary - David Edwin Mason - Capital Punishment
LA Times Archive 1993
https://www.latimes.com/archives/la-xpm-1993-08-22-mn-26483-story.html
People v. Mason
PEOPLE v. MASON (1991) | FindLaw
The Executioners Tale
Former San Quentin executioner reveals how he killed prisoners with no training | Daily Mail Online