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Nathan Carman was accused of killing his grandfather John Chakalos in a 2022 federal indictment, but never formally charged with murder

That indictment suggests the crime was financially motivated

A family member tells PEOPLE that Nathan was "angry" his grandfather was having an affair

In 2022, a federal indictment filed in Vermont charged Nathan Carman with the murder of his mother and accused him of killing another family member .

"On December 20, 2013, Nathan Carman murdered his grandfather, John Chakalos, shooting him twice with [a semi-automatic rifle] while Chakalos slept in his Windsor, CT home," read the indictment, a copy of which was obtained by PEOPLE.

The indictment suggests this was all part of an effort to gain access to his grandfather's fortune, which

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