Rey Misterio Sr., the uncle of World Wrestling Entertainment superstar Rey Mysterio, has died.

He was 66.

TMZ reports that Misterio died on Friday, but there are no details surrounding his death.

Read the full TMZ report.

His son, El Hijo de Rey Misterio (Miguel Aarón López Hernández), confirmed the news via Facebook on Friday.

“Friends and family, I regret to inform you that my father, Miguel Angel Lopez Dias, King Misterio Sr., passed away this morning,” he wrote. “Will keep you updated. Thank you.”

Wrestling reporter Dave Meltzer wrote about Misterio’s death on . In his prime, he was almost like Tijuana’s version of Jerry Lawler in Memphis. As a trainer, his track record is the best, his nephew, the original Psicosis, Konnan, Halloween and Damian are all in the same class.”

Lucha Libre AAA Worldwide shared the following statement via X/Twitter:

“We regret the sensitive death of Miguel Ángel López Días, known as Rey Mysterio Sr. We express our sincerest condolences to his loved ones and raise our prayers to heaven for his eternal rest.”

Misterio was born Miguel Ángel López Díaz in Tijuana in 1955 and initially trained as a boxer before devoting himself to professional wrestling and lucha libre. He made his ring debut in 1976.

He reached new heights in 1990 when he appeared at World Championship Wrestling’s “Starrcade” pay-per-view, where he faced WCW and New World Order legend Konnan (both representing Mexico) at the “Pat O’Connor Memorial International Cup.” “ came together. They would lose to the Steiner Brothers in the second round of the event after defeating Chris Adams and Norman Smiley in the first round.

Misterio is uncle of WWE Superstar Rey Mysterio, whom he trained, and great-uncle of current WWE performer Dominik Mysterio.

With his son El Hijo de Rey Misterio, he once held the Revolution Tag Team Championship and the WWA Tag Team Championship of the World Wrestling Association and was inducted into the Tijuana Sports Hall of Fame in 2006.