Actor Christian Oliver and his 10 and 12 year old daughters were killed in a plane crash on Thursday after their aircraft struck the sea near a Caribbean island.

The 51-year-old actor, known for roles in films like The Baby-Sitters Club, Speed Racer, and Valkyrie, was killed in a plane crash with his 10-year-old daughter Madita Klepser and 12-year-old daughter Annik Klepser, according to a report by NBC News.

Oliver, whose real name was Christian Klepser, had reportedly taken off on a small single-engine plane from the J.F. Mitchell Airport on the small Caribbean island of Becquia on Thursday, to head to Saint Lucia.

But the plane experienced difficulties and crashed into the ocean, the Royal St. Vincent and the Grenadines Police Force said. The cause of the crash is still under investigation.

Oliver and his two daughters were the only passengers on the plane. A fourth person, Robert Sachs, who was the plane’s pilot and owner, also died in the crash, local authorities told NBC News.