A motorcyclist and his passenger were both killed in a Clearwater crash.

Police say 34-year-old Daniel B. Rivers was riding his 2004 Suzuki motorcycle at a high speed Thursday night when he lost control on a curve. Rivers and his passenger, 32-year-old Starr Knotek, were both thrown from the bike. Knotek died at the scene and Rivers died later at a nearby hospital.

Police are still trying to determine whether alcohol was a factor in the crash.