A statement issued by the PPF Group N.V. a privately held international financial and investment group founded in 1991 by the 56-year-old billionaire stated that Kellner was killed in a helicopter crash on March 27 in a mountainous area of Alaska.
Those killed were five Americans, a French national and a Czech national, all of them military service members, the MFO said in a statement. It added that one American MFO member survived and was medically evacuated.