U.S. Army Sgt. Marquinta Jacobs, who pleaded guilty for the shooting death of 51-year-old Lloyd R. Gilbert at Fort Knox, was sentenced to 30 years in prison on Friday, The Associated Press reported.  Jacobs had pleaded guilty on Thursday to charges of premeditated murder and aggravated assault. 

The judge in the court martial also gave Jacobs a dishonorable discharge and a demotion in rank in the U.S. military. The Army Corrections still will decide where Jacobs will serve his sentence.

"Investigators say Jacobs approached Gibert in the parking lot near the Human Resources Command building where Gibert worked," according to The AP.

"I am sincerely sorry for the pain I caused everyone," Jacobs said at the court martial.

"Committing this crime was the worst thing I've ever done. If I could take back what I've done to the Gibert family, I would. I pray that they find it in their hearts to forgive me. I will continue to pray for the Gibert family that they can find peace," Jacobs added.