Concerns remain for three other dolphins seen swimming close to shore, apparently in weak condition.
Kamala rescue workers was notified by local residents of the dolphins at 8:15am, and in turn called the PMBC.
The remains of the fatally injured dolphin have been taken to the PMBC at Cape Panwa, Chief Kongkiat Kittiwatanawong told The Phuket News.
PMBC officers are now trying to provide assistance to the three dolphins swimming near the beach, he said.
The death of the dolphin found this morning follows security guards at a beachfront resort further north at Bang Tao finding an Olive Ridley sea turtle struggling in a fishing net on the beach at 6:15pm on Monday (Aug 26).
The turtle, which had a wound on its front left flipper, was about 10 years old, and measured about 35cm wide and 50cm long.
The security guards cut the fishing net from the turtle and called the PMBC to collect it.
The security guards also reported finding the dead body of another turtle, and due to its advanced stage of decomposition decided to bury it.