NEW YORK (Reuters) - The sister of a former U.S. state prosecutor who killed himself after he was targeted by a television show as a suspected pedophile is suing NBC Universal for $105 million. Louis William Conradt, 56, shot himself in November 2006 after he was confronted at his Terrell, Texas, home by police, whom the lawsuit said were carrying television cameras for a "To Catch a Predator" segment of NBC's Dateline program. NBC has said Conradt had contacted a decoy posing as a 13-year-old boy. But Conradt did not visit the "sting house" the show set up in Murphy,...