FARMINGTON — A man convicted of three counts of aggravated sexual abuse of a child under 12 years old was sentenced Monday to 18 years in prison.

Kenneth Mike Etsitty, a 58-year-old man from Tse-Yah-Toh, near Gallup, was sentenced to 18 years in prison followed by 10 years of supervised release. He will also have to register as a sex offender, the U.S. Attorneys Office said in a press release Monday.

Etsitty was charged with 10 counts of child sex abuse in May 2012 when a girl born in 2002 told FBI agents Etsitty had molested her for years. The girl reported the abuse to FBI agents in February 2012, according to court documents.

In May 2012, Etsitty told agents he started abusing the girl when she was four and continued until November 2011, according to court documents. He abused her while she slept in his home near Gallup.

During his interview with investigators, Etsitty said has had sex and molested numerous young girls. He allegedly said he has been abusing girls for decades, according to documents.

The investigation into Etsitty's past crimes continues, according to court documents.

He pleaded guilty in October to three counts of aggravated sexual abuse against a child.

The abuse happened within the exterior boundaries of the Navajo Nation and was investigated by the Gallup office of the FBI and Crownpoint Division of the Navajo Nation Department of Public Safety.