KINSHASA (Reuters) - Sindika Dokolo, the Congolese businessman and art collector husband of Angolan billionaire Isabel dos Santos, has died in a diving accident in Dubai, a colleague and his family said on Friday.Dokolo and dos Santos, the daughter of Jose Eduardo dos Santos who ruled Angola for 38 years until 2017, faced corruption charges, including allegations that they steered $1 billion in state funds to companies in which they held stakes during her father’s presidency. Both denied wrongdoing. Angolan authorities seized their accounts late last year. The exact cause of the 48-year-old’s death on Thursday was not clear. “The Dokolo family, his wife, children, mother, brother and sisters have the deepest sorrow and immense sadness to announce the passing of Sindika Dokolo,” a post on Dokolo’s Twitter page said on Friday. Isabel dos Santos has not commented, but on Thursday posted a photo of her and Dokolo on Twitter. A colleague and friend of Dokolo, Cedric Mala, and two family members who spoke on condition of anonymity, said that he died while diving. Mala said that Dokolo had years of diving experience and that he always spoke passionately about it.