TYLER, TX (KLTV) - UPDATE: Nate Anderson has entered into a plea agreement for first degree murder with a 20 year sentence.
--Nate Anderson just pleaded guilty and now Smith County DA, Matt Bingham is presenting signed affidavits from Mark and Stacy Anderson. The Anderson's did that so they would not have to testify. Bingham said this is obviously one of the most difficult days of their lives.
--Nate has waived his right to an appeal. As part of the plea agreement, the defense requested Nate's psychological evaluation to be sealed.
--Nate will get credit for time served.
--Judge Jack Skeen sentenced Anderson to 20 years in a state prison. No fines were assessed.
--Smith County DA, Matt Bingham said on January 12, 2011, Nate admitted to killing his sister Amanda, to a psychologist hired by the defense. Bingham added that Nate also discussed his conduct before the killing.
--Bingham says the prosecutors have the 911 call from Nate Anderson. Bingham said Nate did not appear distraught during the call.
--The prosecution said they were determined to certify Nate as an adult, so he would serve a longer sentence.
--Bingham added that when making the plea agreement, he was not going to agree to anything less than a 20 year sentence.
--Nate will have to have served 10 years before he'll be eligible for parole. As of today, Nate has about a year's worth of credit for time served.
Nate Anderson, the 16-year-old Chapel Hill teen accused in his sister's shooting death is expected to enter a plea agreement today.
Nate is accused of shooting his sister, Amanda, 19, four times in the head in the family's Chapel Hill home back in September 2010.
Nate was arrested in October 2010 in the family's church parking lot after a Wednesday service.