It was not immediately clear whether Klein 's husband , Robert Ferrante , had retained representation . Barbara Klein , 45 , a nurse , died on April 9 . The cause of death was cyanide poisoning . Her husband is a professor of neurological medicine at the University of Michigan .
Barbara Klein , 45 , a nurse , died on April 9 . The cause of death was cyanide poisoning . Her husband is a professor of neurological medicine at the University of Michigan .