One of the suspects was a former district attorney, Louis Conradt, who shot himself to death when police entered his home with a search warrant.
Conradt's sister slapped NBC Universal with a $105 million suit claiming that the company took over police duties and failed to protect her brother.
The arrests and the suicide have drawn new attention to the series and whether its tactics are compatible with journalistic or legal standards.
The Dallas Morning News reported that a "20/20" news crew questioned Murphy police chief Billy Myrick about the cases in a City Hall parking lot last week.
"I didn't like their tactics," Myrick told the paper.
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