This takes place on the Freeform training mission, available on the simulated boat.
From the start, pick up the 3 coins in front of you, and use them to lure Mr. Norfolk (white cowboy suit) into the back alley. Subdue him and steal his disguise, feel free to leave the body. Go to Deck 02, find the target; Kalvin Ritter, and talk to him. He will take you to his office where you can equip the Fiber Wire, and garrote him. After killing him, feel free to drag the body to to his washroom and dump it before finishing the level.