The former boyfriend of a La Crosse woman has been arrested for her murder. Thirty-eight-year-old Eric Sackett was already in the La Crosse County Jail serving time for an unrelated sexual assault case. Sackett is to make his first court appearance on the murder of Erin Somvilai today (Thursday). The woman’s family reported her missing June 4th and her body was discovered in Runge Hollow Lake in Vernon County almost two weeks later. It had been weighted down with concrete blocks in an effort to keep it from surfacing. Authorities say Sackett lied when he was interviewed.