FBI investigators have interviewed Homaidan al-Turki, a Saudi national serving eight years to life at Limon Correctional facility, as well as his associates, The Denver Post reported Monday.
Al-Turki is in prison for keeping a housekeeper as a virtual slave and sexually assaulting her.
Investigators are looking at possible financial transactions between al-Turki and members of white supremacist gang 211 Crew, of which Evan Ebel, the main suspect in Clements' killing, was a member, the newspaper said. Police are investigating whether al-Turki paid the 211 Crew to protect him.
A source told the Post al-Turki "has tons of money" he transfers "from account to account" through operatives outside the prison.
Investigators are also examining commissary records and phone conversations.
Al-Turki's lawyer, Hal Haddon, said the suggestion his client was involved in the death of Clements is "outrageous."
"He's been in prison seven years," Haddon said. "He is not a man of great means. He was a Ph.D. candidate at the University of Colorado."
Al-Turki's legal team filed a lawsuit April 8 in Denver District Court saying the Saudi man had been isolated and mistreated in prison since Clements' death.