Around 3:20 pm Tristan was last seen alive by a female witness as he was sitting on a park bench in the Bruno-Asch-Park near
Höchst station. He patted the dog of the witness. As she continued on her way, she saw two men – probably foreign – sat down next to Tristan on the bench.
Probably
between around 3:20 and 3:30 pm Tristan must have left in western direction toward the southern entrance of the Liederbach Tunnel. The tunnel is underneath a train-overpass and was often used as shortcut at that time.
The distance between the Bruno-Asch-Park and the southern entrance of the tunnel is about 100 meters (a little over 110 yards), which means about 5 minutes walk. It is unknown whether Tristan first meets his still unidentified murderer near the tunnel. But police is sure that Tristan knew his murderer. They cannot asses the intimacy of the relationship however. The investigators assume that Tristan’s meeting with the perpetrator that day was possibly prearranged and that he voluntarily went to the tunnel with him. As Tristan was living north of the tunnel, he might also have used it as shortcut on his way home.