A Deputy District Attorney suspects that a nurse has been murdering her rich husbands and relatives by giving them unneeded insulin doses, but his superiors don't believe him.A Deputy District Attorney suspects that a nurse has been murdering her rich husbands and relatives by giving them unneeded insulin doses, but his superiors don't believe him.A Deputy District Attorney suspects that a nurse has been murdering her rich husbands and relatives by giving them unneeded insulin doses, but his superiors don't believe him.