Can a seller after legal transfer of a firearm be held liable for the misuse of that firearm after completion of the transfer?

I would assume not since you are no longer the owner or have possession of the firearm and did not cause the illegal act to occur. ?If, however, you sold it to someone you knew might use it improperly or was not legally entitled to own a weapon or violated State law as to the transfer of weapons, you might be liable.