True Crime for May is Fatal Vision by Joe McGinniss.

From Amazon: Bestselling author Joe McGinniss chronicles every aspect of this horrifying and intricate crime and probes the life and psyche of the magnetic, all-American Jeffrey MacDonald—a golden boy who seemed destined to have it all. The result is a penetration to the heart of darkness that enshrouded one of the most complex criminal cases ever to capture the attention of the American public. It is a haunting, stunningly suspenseful work that no reader will be able to forget.