UPDATE: Rape charges against Charles Pugh were dismissed Monday morning because of the statute of limitations had expired.

Prosecutors were unable to prove the alleged rapes took place within the four-year window of the state's statute of limitations.

Channel 3 has a crew in the courtroom and will update this developing story.

PREVIOUS STORY: A 45-year-old Chattanooga man, Charles David Pugh, has been charged with aggravated statutory rape for an incident that took place between November 1, 2010 and December 23, 2010.

One of the victims was 16 years old at the time and said that he had been raped by Pugh on numerous occasions over the course of several years at Pugh's home.

The Tennessee Department of Children's Services says Pugh may have sexually abused as many as eight boys over the period of several years, according to an arrest affidavit filed in Hamilton County Court.

The affidavit states Pugh was in a capacity “that placed him in a position of trust and limited authority over young men.”

Pugh worked at the Tennessee Valley Railroad Museum (TVRM). TVRM was notified earlier this year about the investigation and Pugh was let go in July.  TVRM declined to comment further on this incident.

A statement from the Tennessee Valley Railroad Museum reads:

“Several months ago the Tennessee Valley Museum was made aware that former employee Charles David Pugh, an engineer and shop machinist, was under investigation for possible criminal charges pertaining to activities outside of his employment at TVRM. Upon our being notified of the investigation by the Hamilton County Sheriff's Department in July, Mr. Pugh's employment was promptly terminated. We have not been further notified of any details of the charges and thus are unable to make any further comment at this time."

Investigators interviewed three of the alleged victims, and could have pursued criminal charges, but the statute of limitations had expired in those alleged incidents.

Pugh is being held in the Hamilton County Jail on a $20,000 bond.