CORPUS CHRISTI, Texas (AP) — A Texas man charged with killing his 77-year-old grandmother and dismembering her body with a chain saw has pleaded guilty to murder.

A judge sentenced David Christy to 20 years in prison Tuesday as part of a plea deal. The remains of Johanna Kruse Christy were found buried in shallow graves behind her home where she lived with her grandson in February 2013.

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