SAN DIEGO – A federal grand jury returned an indictment today charging Matthew Ray Calas of Spring Valley with distributing a powerful synthetic opioid—N-Pyrrolidino Protonitazene—that resulted in the death of a 67-year-old San Diego resident. According to court records, Calas advertised drugs for sale on Craigslist using coded language. In text messages with the victim, Calas offered to sell the victim “red devil nitazene,” a smokeable crystal powder. The victim was found on the floor holding drug paraphernalia, suggesting he died shortly after ingesting the substance. Three months later, Calas sold more of the “Red Devil” to an undercover law enforcement officer.