Bernhard Graumann, 59, was found dead on Friday. Police believe he may be behind an explosive trap that killed a 64-year-old doctor on the same day.
Two other people with connections to Graumann were injured by an exploding piece of firewood in their home.
Those who think Graumann held a grudge against them should contact the police.
Bernhard Graumann, from the small town of Mehlingen in western Germany, died on the night of 1 March at his home. Police are awaiting an autopsy report.