“The 65-year-old drug lord for the powerful Sinaloa cartel was reported dead by Riodoce, a well-regarded weekly in the criminal group’s stronghold of Culiacan, which said it relied on law enforcement and family sources. The paper said it could not confirm where Esparragoza died, and that it might have been in either Guadalajara or Mexico City. It said he didn’t die in a shootout with a rival cartel or with federal authorities — but of a heart attack.”
Source: Mexican cartel kingpin reported dead — of a heart attack – Los Angeles Times