Boat Killer

This unnamed killer kills, with the help of his associate, Dick. It is unknown who he works for but knows that Dick did something, possibly betraying Matthieu Hémery.

Kidnapping and Killing Dick
After the death of Matthieu Hémery and Jean Dick walks home at night when someone knocks him out. He wakes up tied up with cement feet on a ship. The man tells him we know what you did implying that Dick might've betrayed Matthieu Hémery. He then lifts him up with the help of his associate and they throw him into the ocean.