Mr. Weates, who lived in St. Joseph was gunned down at 6th Avenue Barataria tuesday night.
Reports say at around 8 p.m. Tuesday he was in the company of woman when gunshots rang out.
Residents say they later discovered the two, lying in a pool of blood with gunshot wounds to their faces.
The Police and Emergency Health Service were then contacted.
However, it is said by the time they arrived 280-year-old Mr. Weates was dead.
The female was taken to the Eric Williams Medical Sciences Complex where she remains warded in a serious condition.
Residents told investigators they saw a man dressed in dark clothing fleeing the scene.