A glamorous fashion designer who was found dead on a boat at a yacht club on Tuesday had recently celebrated the launch of her chic lifestyle brand at a ritzy Hamptons resort.

Martha Nolan-O’Slatarra, 33, the founder of fashion label East x East, was discovered unconscious onboard a boat docked at the Montauk Yacht Club at around midnight.

Good Samaritans attempted life saving measures, but East Hampton Town Police pronounced her dead at the scene.

Her manner of death remains unclear and will be determined by the Suffolk County Medical Examiner's Office.

But one boater at the scene described the ship, named Ripple, as a 'party boat' and told Daily Mail she heard screams when the woman's body was found.