This 3 June 2019 video says about itself:
Walter Luebcke, 65, was reportedly hated by far-right figures in Germany due to his stance on borders and immigration. He was found dead yesterday – and suicide has already been ruled out because there was no sign of the murder weapon. Although police and prosecutors have released only limited information it is known that he was shot in the head. Some speculated that Nazis could be behind the suspected killing.
Translated from Dutch NOS TV today:
The German police have arrested a 45-year-old man in the case of murdered politician Walter Lübcke. The DNA of the suspect corresponds to traces that have been found, police say. The man is an acquaintance of the police, his DNA was stored in a database.
CDU politician and regional executive member Lübcke (65) was found early this month on the terrace of his house in Wolfhagen-Istha with a bullet wound in his head. He died shortly thereafter.