You won't likely find a Lodge who will give you a membership list, but you might try contacting the Grand Lodge of Louisianna and have them search their records for his name. If he became a Mason in LA, they should be able to verify that for you.

If he lived in another state, and can't find any info in LA, you'll have to contact the Grand Lodge in the state you think he may have been a member.

Good Luck,
Jeff