"WE had our Twitter account hacked," the comedy-rock duo of Black and Kyle Gass tweeted. "We can assure you that Jack is ALIVE and WELL and that this was a sick 'prank.'"
An earlier Sunday post on the Tenacious D account, which has since been removed, said: "I'm sad to officially announce the death of Jack Black at the age of 46, rest in peace brother," Gossip Cop reported.
Subsequent tweets on the account read: "#RipJackBlack" and "It is with a heavy heart I am to announce that Jack Black passed away last night at 3:37am. The cause of death is yet unknown."
The BBC said this is the third time Black has been the subject of a death hoax after erroneous reports surfaced in 2012, claiming he had fallen off a cliff in New Zealand, and again in 2014 when he allegedly died after a stroke.
Black's film credits include the Kung Fu Panda franchise, Goosebumps, Tropic Thunder, School of Rock and High Fidelity.
WE had our Twitter account hacked. We can assure you that Jack is ALIVE and WELL and that this was a sick "prank".— Tenacious D (@RealTenaciousD) June 5, 2016