(KLZA)--A Hiawatha man is accused of sexually assaulting a Nebraska teenager for two decades, with 66-year-old Richard Davidson facing two sexual assault charges in Richardson County, Nebraska.

KOLN-TV, in Lincoln, is reporting that a multi-year investigation led to the charges, filed for incidents alleged to have occurred in 2003 and 2005, with Davidson accused of sexually assaulting the teenager multiple times over a 20-year period.

The TV station reports that the alleged victim, in January, 2021 told a Nebraska State Patrol investigator that she had been sexually assaulted multiple times between the ages of 13 and 15, with the assaults taking place at two of her homes between Falls City and Grand Island.

The victim also alleged that Davidson repeatedly targeted her in a variety of scenarios.

Following further victim interviews through 2022,the investigator interviewed Davidson in October of that year, at which time Davidson denied any sexual contact with the victim, and claims that while he was willing to take a polygraph test, health issues prevented him from doing so.

Davidson was arrested last week, on February 15, and is held in the Richardson County Jail on a $25,000 bond.

His next court appearance is scheduled for March 4.