Method Man is "not ok" after the death of Oliver 'Power' Grant.

The hip-hop star is mourning the death of the Wu-Tang Clan executive producer, who was a major player both for the iconic group's music and its business empire, at the age of 52.

The group confirmed the tragic news on its official Instagram account, as they simply wrote: "Rest in Power, Power."

His death was reported by Hot 97, but no cause of death has been announced.

Method Man shared a photo of them together along with heartbroken emojis, and wrote: "Paradise my Brother safe Travels!! #pookie #power (sic)"

He added: "Bruh I am not OK."

Raekwon wrote: "POWER we been everywhere … now you everywhere! the most high is merciful love you."

And Gza said: "We couldn't have done it without him.

"Wu wouldn't have come to fruition without Power. His passing is a profound loss to us all. My deepest condolences to the fam."

Grant was a founding member of the group and produced several of their albums, while he also created the Wu Wear clothing line.

In 2011, he opened up about his role in expanding the band's output.

He explained to Complex: "Well, you know, at the end of the day, we are all interested in fashion.

"Initially, when we started doing the music, my interests just came from trying to figure out a way to diversify what we was doing, based on the fact that you know, I wasn't a rapper or a producer or anything like that."

He noted at the time that the iconic design was "all him", although he did have a team who helped realise his ambitions.

He added: "That was all me. I had a crew of people who worked with me and helped me achieve and do the things that I wanted to do. But that was all my direction, based on how I saw it.

"At the end of the day, it was just something I made for us, for them to project to the people.

"They never really actively took a part in it like that, although they were influential in the styling of what it was, just from being who they are and me knowing them as my friends, and now, my business partners."

Meanwhile, Wu-Tang Clan has been nominated for this year's Rock and Roll Hall of Fame.