The wolf was discovered one kilometre away from the wildlife park. Staff were not able to get close enough to the animal to administer an anaesthetic.
“What has happened is of course deeply regrettable. We are very sad, but also hopeful that we can get closer to the second wolf so we have the opportunity to give it an anaesthetic,” said animal manager Mats Höggren in a statement.
The search for the second wolf resumed at first light on Friday morning.