The St. Landry Parish Sheriff's Office says there's been a third arrest in the death of a Houston man who was shot in the neck during an argument last month in Sunset.  Kevin Sam, known as "Lucius," was arrested in Lafayette on a first-degree murder warrant in the death of Corneil Landry on March 27th.  Sam's wife, Ashley Prejean, was arrested with him on outstanding Lafayette Parish warrants, and now faces a St. Landry Parish warrant accusing her of failing to tell police where her husband was.