Did anyone ever hear of this legend before?
"Grace Connolly was washing clothes at the edge of a lake when she was attacked by a Dobhar-Chu. Her husband, McGloughlan, heard her cries and rushed to help. By the time he got to her, she was dead and the Dobhar-Chu was still there.
The man killed her attacker who screamed before it died, summoning its mate. McGloughlan jumped on his horse to evade the beast. A friend joined him, but they realized the horses couldn’t outrun it. The dismounted and ducked behind a wall. As the beast hurled over the wall, they killed it.
There is a tombstone near Kinlough that bears a carved illustration of a large otter, impaled by a spear, held by a hand. The first name appears as Grace, but the last one is illegible due to the ravages of the weather. The date on the tombstone is 1722."
The dobhar chu was a huge otter like creature often called the king otter there are many weird tales from lakes around ireland.