YORK, Pa. — A Pennsylvania inmate is admitting he killed his brother when they were teens two decades ago, pleading guilty to third-degree murder so that he could be released from prison in about a year.

Zachary Paul Witman told a York County judge on Thursday that he stabbed to death his 13-year-old brother Gregory in the laundry room of their family home in New Freedom in 1998.

The 34-year-old inmate was a 15-year-old honor student when he stabbed his brother 65 times in the neck and nearly decapitated him.

He’d previously denied committing the crime.

A jury convicted him in 2003 of first-degree murder, resulting in an automatic life sentence.

He now says he snapped because his brother was angry at him for hanging up on his brother’s girlfriend.