DALLAS -- A wounded Iraq veteran and his wife have lost a third child from injuries the boy suffered in a car accident on the way to visit his father in the hospital. Three weeks after his siblings died in an Oct. 13 accident on the gusty West Texas plains, 9-year-old Tyler Johnson died Saturday at Children's Medical Center Dallas. Army Spc. John Austin Johnson was waiting for his wife, Lisa, and their three kids to visit him at Brooke Army Medical Center in San Antonio when the deadly crash occurred on Interstate 10 about 12 miles east of Ozona....