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The once notorious leader of a feared Mexican drug cartel has died in state prison from the novel coronavirus, according to a report.

Moisés Escamilla May, 45, had been serving a 37-year sentence at the Puente Grande maximum-security prison in Jalisco state, BBC reported on Monday.

A Mexican Federal Police officer guards the access road to Puente Grande federal prison near Guadalajara which houses some of the country's most dangerous criminals.

A Mexican Federal Police officer guards the access road to Puente Grande federal prison near Guadalajara which houses some of the country's most dangerous criminals.

He was viewed as a highly dangerous inmate, having allegedly been responsible for the decapitation of 12 people in the Mexican state of Yucatán.

Widely known by his nickname, "Gordo May," he led a group within the Los Zetas drug cartel called "Old School Zetas."

HOSPITALS TREATING CORONAVIRUS PATIENTS IN MEXICO CITY ARE REACHING MAXIMUM CAPACITY: REPORT

At the time of his arrest in 2008, May's group was considered the most feared criminal organization in the Cancún area.

May died in prison on Friday. His death was not officially announced until Sunday.

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As of Monday, there have been more than 35,000 cases of COVID-19 in Mexico, with some 3,465 deaths, according to the latest figures by Johns Hopkins University. Health experts say the actual numbers are likely much higher.