New York City ? The sister of a man who was suspected of being a sexual predator and who killed himself as the cameras of “Dateline NBC” closed in on him sued NBC Universal Inc. on Monday for $105 million.

Patricia Conradt’s brother, Bill Conradt Jr., shot himself last November in a Dallas suburb as police knocked at his door and a camera crew for the newsmagazine waited in the street.

Conradt claims her brother, an assistant county prosecutor, committed suicide after he was accused of engaging in a sexually explicit online chat with an adult posing as a 13-year-old boy. She alleges a police officer at the scene of the shooting told a “Dateline” producer, “That’ll make good TV.”

Bill Conradt, 57, became a target of a series called “To Catch a Predator” in which NBC and the activist group Perverted Justice set up shop for four days last November in a two-story home in Murphy, Texas. Perverted Justice staff posed as boys and girls online and arranged to meet men there.

Two dozen men were arrested, but the district attorney refused to prosecute any of them, saying many of the cases were tainted by the involvement of amateurs. And the city manager was fired for approving the arrangement without telling the mayor or the city council.