FORT WORTH, Texas -- A former Kaufman County district attorney committed suicide Sunday as officers tried to arrest him on charges of soliciting sex with a minor.

Investigators said William Conradt Jr., 56, shot himself Sunday afternoon in Terrell.

Murphy police said Conradt solicited sex from an online decoy posing as a 13-year-old boy.

"Without going into details -- it was extremely explicit," said Detective Sgt. Snow Robertson of the Murphy Police Department.

Sources told NBC 5 that those explicit conversations even included a webcam and the telephone.

Officers showed up at the man's home with a search warrant for his computer. As officers moved in to make an arrest, Conradt shot himself, police said.

Conradt was transported to Parkland Hospital in Dallas, where he later died.

"They [children] shouldn't have to worry about getting on the Internet and worrying about an older person having sex with them," said Robertson.

NBC News confirms the sting operation involved "Dateline" and its "To Catch A Predator" series and issued the following statement:

NBC News' "Dateline" was in Texas reporting on its "To Catch A Predator" series in conjunction with online watchdog group Perverted Justice. In the midst of that effort, Rockwall County Assistant District Attorney Louis W. Conradt, Jr. contacted a decoy from Perverted Justice who was posing as a 13-year-old boy. Local authorities launched an investigation into Conradt's online communications and went to his home with an arrest warrant. In the course of that investigation, Conradt committed suicide. There was no contact whatsoever between Conradt and "Dateline" at any point in the investigation.