Tatort S2014E18 - Batic - 67 - Am Ende des Flurs

Franz Leitmayr and Ivo Batic are investigating their 67th case with the new assistant Kalli Hammermann. It is a complex case involving the death of a mysterious woman that deeply shakes the trust between the detectives. "Your profession is only dead people" Lisa Brenner once said. That and the fact that Leitmayr's job was always more important than anything else was the reason for the end of a love affair that Franz had been really serious about a year and a half ago. So serious that he didn't even tell his colleague Batic about it. Now Lisa's body is shattered on the ground, she fell from the balcony on the twelfth floor of her house. Apparently she wasn't alone while drinking champagne. The neighborhood didn't hear a scream. The police find large cash deposits in the account, but no employer.
The suspicion that Lisa worked as a companion for wealthy men is obvious. The first clues lead to Harry Riedeck, an elderly man who was familiar with Lisa's insurance and regularly shopped for her. When Leitmayr and Batic show up at his house, Riedeck recognizes Leitmayr as Lisa's friend from before. The fact that Leitmayr hadn't told Batic because he wanted to stay on the case as long as possible, investigating it himself, makes Batic explode. Department head Lammert suspended Leitmayr on the spot. A procedure is initiated. While Batic meets the new head of operational case analysis, Christine Lerch, Leitmayr bites deeper and deeper into a case that is taking him more and more to the limits of himself.
Like all other suspects, he is imbued with a deep affection for the dead woman. And like everyone else, he soon no longer knows who Lisa Brenner really was. Using mobile phone photos that he took in Lisa's apartment, Leitmayr came across the trail of Toni Feistl, a Wiesn landlord who had fallen for Lisa. Lerch thinks that she is a woman who recognizes the point in every man where he is lonely and this is how Batic investigates. With the support of the young assistant Kalli Hammermann, he interrogates the men who were in regular contact with Lisa: Hansen, a former Hamburg hockey star, Lischke, a bank clerk and some seemingly irreproachable fathers. Then Riedeck is murdered. Unlike Lisa, whose death happened silently and almost invisibly, Riedeck was killed with 40 hammer blows.
Where does the connection between the two victims lie for the perpetrator, if it was the same? What could it be that someone with such unbridled violence had to get rid of him?