<p>A man pleaded guilty Friday to killing three women _ including his common-law wife and his estranged wife _ after 11 years of denying committing the crimes.</p><p>John Peek, 54, was sentenced to life in prison for each of the murders. He will serve the sentences concurrently.</p><p>His confession comes on the heels of an indictment charging Peek with interfering with witnesses in his upcoming murder trial. Cobb County District Attorney Pat Head said Peek attempted to pay witnesses to give false testimony.</p><p>Peek was arrested in October 2005 for the 1996 murders of his common-law wife Carol Marlin, 46, and her friend and former co-worker Elizabeth Ginn, 64. Authorities charged him in that case 16 days after the murder of his estranged wife, Kasi Peek, 44.</p>
