Norway's Directorate of Fisheries said Freya was put down early Sunday "based on an overall assessment of the continued threat to human safety."
"Through on-site observations the past week, it was made clear that the public has disregarded the current recommendation to keep a clear distance to the walrus," it said. "Therefore, the Directorate has concluded, the possibility for potential harm to people was high and animal welfare was not being maintained."
The head of the directorate, Frank Bakke-Jensen, said other options — including moving the animal elsewhere — were considered. But authorities concluded it wasn't a viable option.
"We have sympathies for the fact that the decision can cause a reaction from the public, but I am firm that this was the right call," Bakke-Jensen said. "We have great regard for animal welfare, but human life and safety must take precedence."
Atlantic walruses normally live in the Arctic. It is unusual but not unheard of for them to travel into the North and Baltic Seas. Another walrus, nicknamed Wally, was seen last year on beaches and even a lifeboat dock in Wales and elsewhere.