A Georgia man executed his 72-year-old mother and 73-year-old stepfather inside their own home after they returned from celebrating the stepdad's birthday, telling cops he was "tired of them and just wanted to be alone," according to police.

"He did not know how many times he shot both parents after the first initial shots to the head," an arrest warrant says of Martin Duberry, who is charged with two counts of felony murder and other crimes related to the slayings, according to local police .

Duberry, 31, called 911 himself to report the shooting attack after it happened at a home in Cobb County on Dec. 6, local NBC affiliate WXIA reports. His mother, Monica Brookins, and stepfather, John Wells, had been out celebrating Wells' birthday when they returned home and were killed by him, acc

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