In 2008, St. Paul police Sgt. William Haider received a complaint from a woman in England that sounded too bizarre to be true.
"It was a bit unbelievable," Haider said. "It was like a movie plot."
But he took her seriously after Scotland Yard and others dismissed her concerns. Soon, he was on the trail of a Minnesota nurse, a man who was posing as a woman in online chat rooms and encouraging people to commit suicide.
Haider was named Detective of the Year on Tuesday for his work on the case, which resulted in the conviction of William Melchert-Dinkel last year in the suicides of a man in England and a woman in Canada.
Police Chief Thomas Smith credited Haider with obtaining an admission of guilt from Melchert-Dinkel, 49, of Faribault.
"He's recognized nationally, and probably internationally," Smith said of Haider.
Haider has worked on the Internet Crimes Against Children Task Force since 2003.
"It was certainly the biggest case of my career," Haider said. "What's important is that two people who are no longer here ... will get their justice."