Who Killed Paulette Burleson?

Just after 10 p.m. on May 18, 2010 in Houston, Texas, Tracy Burleson calls 911 to report that his wife, Paulette Burleson, has been shot to death in the front of their house. When first responders arrive at the scene, they find 56-year-old Paulette dead in the driveway with blood pooling beneath her head.