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Charges of criminal sexual conduct against a 44-year-old youth program volunteer from Ramsey have been amended by Anoka County authorities, who allege he victimized six boys 13 or younger and may have tried to lure others through a phony Facebook persona — that of a 13-year-old girl.

Chad Geyen, who was charged in late November with three counts of criminal sexual conduct involving four boys, now faces five counts, along with one of soliciting a child to engage in sex. According to the charging documents, the incidents date from the 1990s to within the past year. Four of the six boys are now adults.

Geyen met at least one boy through his 1989-1993 association with the Big Brothers organization, according to court records. Geyen recently was part of the Young Eagles, a group that serves youths interested in aviation. A licensed pilot, he has flown with more than 100 Young Eagles, according to the association's website.

Some of the alleged assaults occurred at Geyen's home, at his cabin and at the airport in Blaine, according to the charges. Incidents involved acts of oral and anal sex.

One boy, now an adult, said he was paid $20 for a sexual act with Geyen. Another told authorities that he was 5 when he met Geyen and that there were at least 100 incidents of sexual abuse. That boy was Geyen's foster child.

An investigation of Geyen's computers found a link to a "boy-love" website, according to the complaint released this week. Authorities also found in Geyen's electronic devices a fictitious Facebook account for Maddi Ray, a 13-year-old female. On one occasion, three years ago, the account engaged six teenage boys in a lewd conversation in which Geyen allegedly talked about a photo he has of one of the boy's genitals, according to court records.

Paul Levy • 612-673-4419