A beluga whale that lived off Norway’s coast and whose harness ignited speculation that it was a Russian spy, was not shot to death as claimed by animal rights groups but died of a bacterial infection, Norwegian police said Friday.

A final autopsy by Norway’s Veterinary Institute “concludes that the probable cause of death was bacterial infection — possibly as a result of a wound in the mouth from a stuck stick,” Amund Preede Revheim, head of the North Sea and Environment section of the police in south-western Norway said.

“There have been no findings from the autopsy that indicate that the whale has been shot,” he stressed, adding that the autopsy had been “made difficult by the fact that many of the whale’s organs were very rotten.” As there was no indication of foul play, there was no reason to start a criminal investigation into its death, Preede Revheim said.

The tame beluga, which was first spotted in 2019 not far from Russian waters with a harness reading “Equipment St. Petersburg,” had been nicknamed “Hvaldimir,” combining the Norwegian word for whale – hval – and the first name of Russian President Vladimir Putin.

It was found floating in a southern Norway bay on Aug. 31.

In September, animal advocate groups OneWhale and NOAH filed a police report saying that the animal’s wounds suggested it was intentionally killed.

They pointed at several wounds found on the animal’s skin, including what was interpreted as a bullet hole.

“Assessments made by the Veterinary Institute and the police’s forensic technicians are that these are not gunshot wounds. X-rays of the chest and head were carried out without any projectiles or other metal fragments being detected,” police said in a statement.

Earlier, police had described a stick about 35 centimeters (14 inches) long and 3 centimeters (1 inch) wide which was found wedged in the animal’s mouth, its stomach was empty and its organs had broken down, police said. No further details were given.

The 4.2-meter (14-foot) long and 1,225-kilogram (2,700-pound) whale was first spotted by fishermen not far from the Arctic town of Hammerfest.

Its harness, along with what appeared to be a mount for a small camera, led to media speculation that it was a “spy whale.” The Russian military has a history of trying to weaponize sea mammals, CBS News previously reported. Last year, British military spies said Russia appeared to be training combat dolphins to counter Ukrainian forces.

Moscow has never made any official response to claims the whale could be a “Russian spy.”

There was no immediate reaction from OneWhale or NOAH.

“The manner in which Hvaldimir died doesn’t impact the work OneWhale did to protect him and advocate for him over the last 5 years,” OneWhale said in a statement last month. “We are proud to have made incredible progress working with Norwegian scientists, veterinarians and government.”