Chief Thandisizwe Diko II has died after a short illness, the KwaBhaca Great Kingdom said in a statement on Monday morning.
He was 43 years old.
"Ingonyama Madzikane II Diko passed away in the afternoon of Sunday, 21 February 2021 in East London, following [a] short illness," the kingdom said.
"iSizwe samaBhaca and the royal family are still coming to terms with this shocking and painful loss of our beloved father, son and husband, and will make further announcements once the kingdom has finalised the arrangements for the burial."
Diko was the husband of beleaguered presidential spokesperson Khusela Diko, who took a leave of absence due to her husband's involvement in a controversial R139 million personal protective equipment (PPE) tender last year with the Gauteng health department.
The tender is alleged to have been inflated by 800%.
The Special Investigating Unit is still trying to recover some of the money.
The cause of his sudden death is still unclear, but a source close to Diko has undertaken to provide more information soon.