BELTON -- Four Killeen teen-agers were sentenced to federal prison Thursday, for their roles in the June 21, 1999, slayings of an Iowa couple who were carjacked and murdered while visiting Bell County.

U. S. District Judge Walter S. Smith Jr. sentenced the four during court proceedings in Waco, according to the U.S. District Clerk's office.

Tony Sparks, 17, of Killeen, previously pleaded guilty to a carjacking charge and on Thursday Sparks sentenced him to life in prison without parole.

"If you get life in the federal system, it's life," federal prosecutor Mark Frazier previously told the Telegram.

Terry Terrell Brown and Christopher Michael Lewis both pleaded guilty to second-degree murder charges in December 1999.

Brown was 17 at the time of the killings and Lewis was 15.

On Thursday, Sparks sentenced each man to 188 months (more than 15 years) in prison.

They did not face the death penalty because they testified for prosecutors in the June 2000 trials of Christopher Andre Vialva and Brandon Bernard.

Vialva and Bernard -- both of Killeen -- were convicted of murder last June and sentenced to die.

Both were 19 at the time of the murders.

They were convicted of killing Stacie Bagley, 28, and her 26-year-old husband, Todd Bagley.

Vialva was convicted on two counts of murder and Bernard was convicted for the murder of Stacie Bagley only.

Gregory Hardin Lynch, 16, of Killeen provided the .40-caliber Glock semiautomaric handgun was used in murders.

Lynch previously pleaded guilty to the felony crime of possession of a stolen weapon. On Thursday, he was sentenced to five years in federal prison.

The Bagleys were carjacked in Killeen and murdered in a remote area of Fort Hood -- which is how the crimes entered the federal judicial system.

The Bagleys -- who were visiting relatives in Killeen -- were driven around for hours and then each shot in the head as they pleaded for their lives, according to testimony.

Their charred bodies were found inside the trunk of their burned 1989 Buick LeSabre.

In December 2000 a seventh defendant -- one who was not involved with the carjacking or murder -- pleaded guilty to a felony theft charge involving Stacie Bagley's stolen wedding ring.

Sherwin Matthew Semple, 34, of Brazoria pleaded guilty to the theft charge in a Bell County district court and was sentenced to the maximum two years in state jail.

Prosecutors believe Semple got Todd and Stacie Bagley's wedding rings from Sparks, pawning them in the Houston area for $300.

Ms. Bagley's wedding ring has been returned to family members in Iowa.

Her late husband's ring was never recovered.