The body of a killer whale was discovered in France's Seine River.

An orca discovered dead in the Seine, according to Sea Shepherd. The "vital" animal was to be euthanized.

A killer whale that had been stranded in the Seine and was scheduled to be killed has died.

Marine conservation organisation Sea Shepherd France stated on Twitter that "they have discovered the corpse of the orca"

Autopsy will disclose reason of death, but it was considered too sick to save after one unsuccessful try.

The whale likely had black fungus, or mucormycosis. The sickness spreads from the skin to the lungs, heart, and brain, potentially explaining the animal's confusion.

Experts agreed that the whale must be euthanized to stop its misery.

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