Founding member of Jackson 5, Tito, tragically died last week, and now his cause of death has been revealed by a family friend. The brother of the late Michael Jackson was driving from New Mexico to Oklahoma when he made a stop on the way, and tragedy struck. Steve Manning, a family friend, told how he pulled up at the American Heritage Plaza shopping center on September 16 when emergency services had to be called over reports of a heart attack. The 70-year-old’s death has devastated fans, with many Tito Jackson supporters issuing tributes in his name after hearing the news. Sadly, he is among…