Both men apparently died from gunshot wounds, and a firearm was found at the scene by police.
The older brother, Karl Moosgöller (64) had a long history of psychological problems, and had been living on his own since his divorce. His younger brother Johann (60) had visited his older brother at his home in Afterbach.
When Johann failed to return home, his wife visited the house, to find her husband lying dead on the sidewalk outside.
Neighbours had heard shots and called the police, who found the body of the older brother inside his farm.
Police believe that forensic evidence showed the older brother had fatally shot his 60-year-old younger brother outside, then had gone inside and committed suicide. They are not looking for anyone else in connection with the incident.
Karl was known locally as a psychopath, having lived a very isolated life, with his windows always closed, and his back door nailed shut. The house was described by a neighbour as looking like an FBI bunker, with several telescopes, presumably for spying on visitors.
One of the visitors who owned a nearby second home asked neighbours about Karl's house, and was told "Don't disturb him. He's a dangerous psychopath."