Valentine began abusing the boy in April 2016, according to Douglas County District Attorney Ryan Leonard.
The boy purchased pepper spray to protect himself, but he started developing stomach pains. Hospital personnel testified that stomach pains in children were often related to anxiety over stress in a child’s life.
The victim’s stomach pain eventually led detectives to two other victims, including the boy’s sister. The victims, who are now women, testified that Valentine abused them when they were younger.
The man’s relationship to the victims was not released.
"It takes a great amount of courage for a teenager to testify about sexual abuse in a courtroom full of strangers," Assistant District Attorney Sam Newman said in a statement. "(Valentine) has been stopped as a result of the bravery of these witnesses."