German prosecutors in Bavaria said they are investigating a suspect for threatening the Austrian doctor who died by suicide after she was targeted by Covid-19 conspiracy theorists and anti-vaccination activists. “There is an investigation against a male person from Upper Bavaria with us,” confirmed a spokesman for the Munich II public prosecutor’s office on Tuesday. Lisa-Maria Kellermayr, 36, was known for her public advocacy of Covid-19 vaccines and often appeared in the media. Before her death, she said she had been a recipient of a deluge of death threats and harassment. Kellermayr was foun…