VARNVILLE, S.C. — Elizabeth “Libby” Murdaugh, the mother of Alex Murdaugh who played an important part in her son’s adamant denials that he killed his wife and son, has died. Libby Murdaugh was in hospice care Tuesday when she died, according to Peeples-Rhoden Funeral Home in Hampton County. But a video — taken by his son just minutes before he …