Investigators are trying to figure out what led to a bizarre incident in Pueblo.
45 year old Clark Williams is in a Pueblo County jail cell... for illegally trying to bury his mother's body in a cemetery.
Sheriff's deputies say he did not report her death a month ago.
He told police she'd died of natural causes.
Investigators say Williams tried to bury his mother in a shallow grave, after placing her in a home made casket.
Williams is charged with second degree criminal trespassing, concealing death, and abuse of a corpse.
The sheriff's office plans to reveal more details later today.