A former youth pastor at a conservative Mesquite church accused of raping a teenager for more than a year pleaded guilty Friday in Dallas County to three counts of sexual assault of a child.

Steven Aaron Winn (Dallas County Sheriff's Department)

Steven Aaron Winn, 34, was sentenced to four years on each count as part of a plea deal, with the prison terms to run concurrently. He had faced up to 20 years behind bars on each count.

He will have to register as a sex offender upon his release.

Winn, a Crandall resident, was an assistant youth pastor at Open Door Baptist Church on South Belt Line Road. Police arrested him in February 2018 after learning that he'd been in a sexual relationship with the victim — a student at the church's Christian academy — for more than a year, starting when she was 15.

Church officials have previously said that Winn was a volunteer at the church, not an employee. No one at could be reached for comment at the church Friday.

Winn still faces one count of sexual assault of a child in Kaufman County. He was indicted on the charge last month, court records show.

Days after Winn's arrest, his father was arrested on one count of sexual assault of a child. A church member told police that Larry Allen Winn, 76, had raped her three years earlier, when she was 16.

Larry Allen Winn, Robert Arnold Ross (Dallas County Sheriff's Department, Mesquite Police Department)

The elder Winn ran the bus ministry at Open Door, providing children rides to and from church services and Sunday school.

That case is still pending. Larry Winn is free on $25,000 bond.

Additionally, the church's then-pastor, 71-year-old Robert Arnold Ross, was arrested on charge of failure to report the abuse.

Police say Ross learned about the allegations against Steven Winn more than two weeks before police did and did not tell authorities.

That case, too, is pending, and Ross is free on $2,500 bond. He is no longer the pastor at Open Door.