SAN MATEO (CBS SF) — A 50-year-old San Bruno resident, charged with murdering a neighbor following the gruesome discovery of human remains inside his home and in the backyard, has pleaded not guilty, prosecutors said Monday.

David Stubblefield is charged with murder, being a felon in possession of a firearm and tear gas and destroying or concealing evidence in the death of 77-year-old Benjamin Roybal.

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After making his plea, the judge ordered Stubblefield to remain in custody on $10 million bail.

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Prosecutors said they believe Stubblefield got into an argument over the price of a space heater with Roybal. He then allegedly sprayed Roybal with pepper spray and shot him to death with a handgun.

In an attempt to dispose of the body, Stubblefield allegedly cut up Roybal’s body and used chemicals in an attempt to dissolve the remains.

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Stubblefield was ordered to return to court on May 22 at 1:30 p.m.