A US investor and his wife have been found dead in a Washington DC hotel room.

Murray Gibson, the former chairman of the investment company that owned shares in MurrayGribbs, the largest private equity firm in the world, was found dead at his Washington DC home on Friday, according to his son, Doug Gibson.

Doug Gibson told The Associated Press that his father had been taken to hospital but declined to give further details.

MurrayGrives has said it was a suicide.

Doug said his father was in a “state of shock” and was not a “troublemaker”.

He said the company had lost more than $30bn since his father took the helm in 2007, but that MurrayGobbs had been a “big, bright, bright spot” in the investment world.

Doug, who has three children, said MurrayGigbs’ “fervent faith in us” had given him “the ability to be able to step away from our father in this very difficult time”.

Doug Gibson said Murray had spent years leading MurrayGrimbs, which invested in a number of companies including Microsoft, Google and Amazon.

He said he was not aware of any conflicts of interest.

“He was a very strong advocate of the public’s right to know,” Doug said.

“If I had any knowledge of any conflict of interest or anything else, I would have done nothing about it.”

Doug Gibson declined to discuss the cause of death.

In a statement to the AP, MurrayGrigans’ son said his mother had been taking medication for depression at the time of her death.

Doug added that Murray had a “good relationship with all of us and was a great father”.

MurrayGus has said the “long, slow death” of his father has left him feeling “completely devastated”.

“It has devastated my family and me,” Doug Gibson added.

“It’s been a long, slow, painful death.”

MurrayGinss son, Michael Gribbs Jr, said he hoped MurrayGrams “will live a long and full life with dignity and honor”.

The pair have both lived in Washington DC since 2011.

Murray had been involved in a long-running legal battle with MurrayGigs brother, Michael, who is accused of fraud and embezzlement, and other individuals, including a US federal judge.

The case has drawn attention to the high costs of private equity, particularly at a time when public sector pension funds are under pressure.

Murray was also involved in the firm’s investment in the healthcare giant Medicare, which it bought in 2013 for $13bn.

Murray also led MurrayGiggys investment in Amazon, which has grown rapidly since the company went public in 2013.

The firm is the world’s largest private employer, employing more than 1 million people.