Published: Mar 25, 2014 11:10 AM EDT
Updated: Mar 25, 2014 12:14 PM EDT

LEE COUNTY, Fla.- A 17-year-old, accused of murdering a mother and her teenage son, pleaded no contest to two Second Degree Murder charges and robbery.

Clayton Combs faces a maximum sentence of 480 months in prison, which is 40 years. He has agreed to testify in trial against Justin Wirth, a 16-year-old also accused of the crime.

Both teens were arrested in the deaths of Amy Lorah and her 16-year-old son William Dalton Haley back in April of 2013.