vacant lot purchase divorced absentee owners

[Ryan Pleasant]

First off thanks for all responses! Scenario: vacant residential lot in baton rouge, la 0.25 acres. attempting to buy for personal use. Located absentee owner through county clerk. Contacted him to make offer and he informed me that he'd be willing to sell but the lot is owned by him and his ex-wife, and that he doesn't have any means to contact her. Wondering what our options are; is he able to sell without her?