A Texas man has pleaded guilty to kidnapping his estranged wife, tying a block of concrete to her, and throwing her from a bridge into Lake Worth to drown. Elizabeth Arellano, 28, and Rodolfo Arellano, 36, met at Diamond Hill-Jarvis high school in Fort Worth, Texas. The couple were together for 13 years had four children together, the Fort Worth Star-Telegram reported.  Shortly before Rodolfo murdered Elizabeth, she had said she wanted to divorce him.