The former Odessa missionary to Malawi who was accused of sexually abusing 11 orphans has pleaded guilty in federal court.

Gerald Dean Campbell, 66, pleaded in Magistrate Judge David Counts’ court to one count of engaging in illicit sexual conduct in a foreign place. He was originally indicted on two counts.

His sentencing has not yet been scheduled. Campbell could face between 10 years and life in federal prison.

As part of the plea agreement, Campbell admitted to sexual acts with eight orphans, all minor children, who were living at the Victory Christian Children’s Home in Malawi between 1997 and 2009, a U.S. Department of Justice news release reported.

The release stated that Campbell admitted to offering amenities such as hot water to lure the victims into his house and sexually abuse them. One of the victims was suffering from HIV.

Campbell told investigators he knew what he was doing was wrong and said he thought no one would believe the minors if they told; he also said he sent money to some of them to keep them quiet.

Authorities started investigating Campbell, the manager of the orphanage, on June 5, 2014, after they received a tip about him reportedly abusing boys at the orphanage.

One of the boys, was 21 years old when federal agents contacted him in October 2015, said he arrived at the orphanage in 1999 after losing both of his parents and began to sleep at Campbell’s house for months at a time, where Campbell forced him to do sex acts.

He slept naked in Campbell’s bed and Campbell reportedly forced him to perform a number of sexual acts.

Reports of the abuse started around August 2009, after which Campbell resigned from the position because of the accusations of “immoral sexual behavior,” according to the complaint.

Trial Attorneys Leslie Fisher and Austin Berry, as well as Assistant U.S. Attorney Brandi Young, prosecuted the case. Michael King was the defense attorney.