You might try the St. Tammany Parish Library site for the Poole Funeral Home Records. Go to www.sttammany.lib.la.us
. Click on "genealogy" and then on STPL Gen. Home Page.
Also go to www.usgwarchives.net/la/washington.html
. This will take you to Washington Parish where you can click on "Obituaries". These aren't indexed but with lots of scrolling and a little time you might find what you need.