BOULDER, Colo. -- A teenager accused of helping a friend try to dispose of the body of a Lafayette mother entered a guilty plea Thursday in the case.

Jared Guy pleaded guilty to tampering with evidence. He will be sentenced on Sept. 21.

Guy is one of three teens charged in connection with the slaying of Linda Damm, 52. The decaying remains of the single mother were found by Lafayette police on Feb. 28 in the back of her Subaru, which was parked in the garage of her home at 705 W. Brome Place.

Police accused Guy of trying to help dispose of Damm's body, first in a landfill and a second time by burying it in a cemetery near his high school.

The day after Damm's body was found, Guy was awarded the Metropolitan Mayors and Commissioners Youth Award by Boulder County commissioners for overcoming adversity and serving as an inspiration and role model.

Guy's lawyer said in a motion filed last March that the 18-year-old suffers from attention-deficit disorder and developmental brain problems which were caused by premature birth and poor care in an Indian orphanage.

Bryan Grove, 17, faces charges of first-degree murder in the same case. He and Guy are close friends, according to police. Both came to the United States from orphanages in India.

Tess Damm, 15, faces charges of conspiracy to commit first-degree murder. She is Linda Damm's daughter and Grove's girlfriend. She and Grove are charged as adults in the case.

The fourth suspect, a 16-year-old, pled guilty to class-four felony of accessory to a crime in juvenile. He agreed to the maximum sentence of two years in the Department of Youth Corrections.