It was on March 21st of this year when Rock County Sheriff's deputies found the body of 64-year-old William Vahey after he took his life in Luverne. Officers then passed the case over to the FBI.
"The investigation had been ongoing, but Minneapolis really became involved in the matter after the discovery of Mr. Vahey in Luverne," FBI investigator Kyle Loven said.
According to the FBI investigation, Vahey's criminal past started after he was arrested in California in 1969 for child molestation.
Three years later, he began teaching at different American schools around the globe. His travels took him to Indonesia, Iran, Lebanon, Spain, Greece, Saudi Arabia, Venezuela, the United Kingdom and Nicaragua. School officials in Nicaragua recently approached Vahey about a flash drive containing sexually graphic images of over 90 boys. Not long after that, he was found dead in Luverne.
Yet, why was he in Luverne, Minnesota?
"There have been reports that he had relatives in the Luverne area. The FBI has not been able to affirmatively state that was the reason he ended up in Luverne," Loven said.
Vahey admitted to school officials that he had preyed on boys his entire life, drugging them so they wouldn't know what was happening.
"To date, we have identified 90, and if there are additional victims out there, we would like for them to contact the FBI and indicate what their encounters were with this person," Loven said.
Loven says FBI offices across the country are taking part in the search for potential victims.
"Out of an abundance of caution, given the fact that he taught students globally, we simply wanted to get the information out and, as best we could, try to indicate and inform former students of this man," Loven said.
Even though Vahey is dead, investigators still want to know if there are any missing pieces to the story.
"If there are others who had knowledge or actively helped him, obviously we would take a close look at that," Loven said.
It is not believed that Vahey shared or traded any of these sexually explicit photographs with anyone else, but Loven says his suicide only leaves more questions for investigators to answer.
If you have any information that can help investigators in this case, be sure to go to the FBI website.