K.C. Johnson and Todd Lighty report that the Bison dele disappearance case has taken a strange turn. The FBI has joined the investigation and they are looking for Dele's brother, Kevin Williams for questioning.

Kevin Williams was questioned by Phoenix Police last week after he allegedly tried to buy about $150,000 in gold coins while posing as Dele. He has not been seen since, but his mother, Patricia Phillips, said she had received anguished calls from him Tuesday and Wednesday.

In those calls, Phillips told the Tribune, "[Kevin] said, 'Mom, I just need you to believe me. I wouldn't hurt my brother. I need to know that you love me before I die. I can't go to prison. You know my personality is the type that can't survive in prison. Nobody will believe my story.'"

Dele, his girlfriend, Serena Karlan and Bertrand Saldo, the captain of Dele's 55-foot catamaran were sailing from Tahiti to Hawaii two months ago when the vessel disappeared. "We're involved in this case as a missing persons investigation," FBI spokesman Andrew Black said. "We're interested in the disappearance of those three people. "One of the individuals we are actively looking to speak with is Kevin Eugene Williams."

Dele has not been heard from since July 8th. The mystery deepened a month later when a man who identified himself as Brian Williams tried to buy a quantity of 1-ounce gold coins from Certified Mint, a precious metal and investment house in Phoenix. Dele, who had played at the University of Arizona as Brian Williams, apparently kept his financial records, such as banking accounts, in that name.

After learning that the bank was investigating whether the check for the coins was fraudulent, arrangements were made to stake out Certified Mint. When the man arrived to pick up the coins, he was taken into custody by the Phoenix Police.

Detectives questioned the man for several hours. But they released him, a department spokesman said, because they did not have enough evidence to bring charges, even though the man had three credit cards and a passport issued in Brian Williams' name.

Phillips said authorities told her the FBI believes Kevin Williams had fled to Mexico.