KANSAS CITY, Kan. (AP) — A Kansas couple faces upgraded murder charges in the death of the man’s missing 7-year-old son.

Online court records show Wyandotte County prosecutors have charged Michael A. Jones and Heather Jones with premeditated first-degree murder and felony child abuse. They were previously charged with first-degree murder and felony child abuse.

The premeditated first-degree murder charge carries a possible life sentence without parole for 50 years.

Police found juvenile remains at the couple’s Kansas City, Kansas, home in November while investigating a domestic disturbance. Authorities haven’t said if the remains were those of Jones’ missing son.

A preliminary hearing for Michael Jones is scheduled for April 8. Records show Heather Jones’ preliminary hearing has been canceled while she undergoes a mental evaluation.

Their lawyers didn’t immediately return calls seeking comment Thursday.