Johan assigned Kürten to guard Nina Fortner at Heidelberg Castle until his arrival, promising him a large sum of money. When Dr. Tenma arrived, Kürten attempted to kill him, but Nina intervened and asked Tenma for something to bind the man (the tie Eva had given him). Both Nina and Tenma escaped. With his hands tied by the necktie and unable to move, an unseen figure (presumably Johan) murdered him in cold blood immediately after the pair departed.
Spoiler
Because Lunge found Tenma's tie at the scene of the crime, he became the primary suspect in the investigation of Kürten's murder.
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