Thanksgiving is a holiday that will forever bring Alexandra Barrera pain and grief. Over Thanksgiving weekend last year, Barrera’s husband and high-school sweetheart, Edwin Alvarado, was killed in a triple shooting at a Toronto sports facility. In her first-ever interview for Global TV’s new series “Crime Beat Most Wanted” launching September 30, Barrera renewed her pleas for help in capturing the man police say ruined her life.