Bomb suspect turns self in Dallas victim's half brother arrested after 'Most Wanted' episode 11/11/2002 By RICHARD WHITTLE / The Dallas Morning News A man wanted in the July pipe bombing that nearly killed his Dallas half brother turned himself in after America's Most Wanted profiled the case on TV, a federal Bureau of Alcohol, Tobacco and Firearms spokesman said. Prescott W. "Scott" Sigmund, 35, who disappeared three days after the explosion in a Washington, D.C., parking garage, walked into a police station in Missoula, Mont., shortly before 11 p.m. Dallas time Saturday after the broadcast aired, said ATF...