Monsieur Costa

History
Monsieur Costa was a local elementary school teacher. Some of his students in the past were Louis, Camille. and Léna.

He and his wife survived the flood resulting from the broken dam 35 years before the events of season one. A few months after the flood, Monsieur Costa showed his wife pictures that his student, Louis, had drawn in class. These drawings depicted the dam breaking, and they were drawn weeks before the accident. Later that day his wife drowned in the lake in front of their house.

Costa was involved in the Lewanski attack. He drove Pierre and his accomplice to the Lewanski house.

Season 1
Monsieur Costa believes that he is going mad after seeing his recently returned wife. After having the local nurse give him his medication early, he straps his returned wife to the bed and sets the house on fire. Later that morning he commits suicide by jumping off the top of the dam.

When Camille asks Madame Costa why she thinks her husband committed suicide, she responds saying that he must have done it because "she was now too young for him."