(CNN) German police suspect a landscape gardener is responsible for killing one man and injuring two other people from beyond the grave.

Bernhard Graumann, 59, was found dead from unknown causes at his home in Mehlingen in western Germany on Friday.

Earlier that day, a 64-year-old doctor was killed by an explosion that appeared to come from a booby trap laid outside his practice in Enkenbach-Alsenborn, local police said in a statement.

The doctor, who has not yet been named, is thought to have triggered the explosive when he bent down to pick it up, police said.

Two days later, a mother and daughter were injured when a log that appeared to have been tampered with exploded in a wood-burning stove in Otterberg, less than six miles away. The younger woman, who has not been named, remains in hospital -- her condition is not thought to be critical.

A sign welcomes visitors to Mehlingen, where the dead suspect lived.

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