ALLENTOWN, Pa. -

A soldier who was convicted of working with his then-14-year-old girlfriend to kill her mother was formally sentenced Monday.

Lehigh County Judge Maria L. Dantos told Caleb Barnes that he'll be "locked in a cage for the rest of your natural life" as she imposed the mandatory sentence of life in prison without parole. She added to that 22 to 44 years for other counts.

Barnes decided not to talk at his sentencing hearing for the death of Cheryl Silvonek, but the smirk the judge said he had on his face spoke volumes.

Dantos said she wanted it on the record.

Before giving the 22- year-old life in prison without parole, plus 22 to 44 years, the judge told him "You must be removed from society forever."

She also called him cartoonish when he would stand at attention in court.

Dantos said, "Like you are presenting yourself as a man of honor. You have none." She went on to say, "You can take your stance of attention to state prison."

A jury found Barnes, 22, guilty last month of first-degree murder for the death of Cheryl Silvonek.

Prosecutors said Barnes and Jamie Silvonek killed Cheryl Silvonek, 54, because she didn't approve of their relationship.

Jamie Silvonek was also convicted of the crime. She's currently serving 35 years to life behind bars for her role in the murder, but she has filed an appeal.

Barnes' attorney said his client will also appeal.