Montauk Yacht Club FILE PHOTO

Police are investigating the death of a woman found on a boat docked at the Montauk Yacht Club early on Tuesday morning, August 5.

Suffolk County Police Department is leading the investigation at the Montauk Yacht Club. T.E. McMORROW

Suffolk County Police Department has a command center set up at the scene near Montauk Yacht Club. T.E. McMORROW

Suffolk County Police Department has a command post and laboratory set up at the scene. DOUG KUNTZ

Suffolk County Police direct the mobile command center at Montauk Yacht Club. DOUG KUNTZ

Police had a dock cordoned off the as the investigation continued throughout the day on Tuesday. DOUG KUNTZ

Police investigate aboard “Ripple,” the boat on which Martha Nolan O’Slatarra was found dead. DOUG KUNTZ

The Suffolk County Medical Examiner’s office removed evidence from a boat at the Montauk Yacht Club on Tuesday evening, nearly 18 hours after a woman was found dead. DOUG KUNTZ

The woman was found dead aboard Ripple, a 54-foot cabin cruiser, which is berthed next to a large center console named Hell In a Bucket. Both boat names reference Grateful Dead songs and owned by the same person, other boat owners at the Montauk Yacht Club said. T.E. MCMORROW

The woman was found dead aboard Ripple, a 54-foot cabin cruiser, which is berthed next to a large center console named Hell In a Bucket. Both boat names reference Grateful Dead songs and owned by the same person, other boat owners at the Montauk Yacht Club said. T.E. MCMORROW

A witness said police focused the investigation on an area with a brown tabletop and blue seats. On the seat and table, there was a white powdery substance. T.E. McMORROW