For nearly a decade, Dolly Oesterreich kept an unbelievable secret hidden just feet away from her husband. Her lover, Otto Sanhuber, was living in the attic.

In 1922, that secret turned deadly when Fred Oesterreich was found shot to death and Dolly was discovered locked in a closet. What initially looked like a burglary gone wrong soon began to unravel, exposing a bizarre web of secret relationships, manipulation, and murder.

This week, we dive into Otto’s hidden life, the murder of Fred Oesterreich, the evidence that led investigators back to Dolly, and the legal twists that allowed her to escape a murder conviction.

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Sources
How Dolly Oesterreich Kept Her Lover In The Attic For 10 Years
The Story of Murderer Walburga Oesterreich | They Will Kill You
The "Bat Man" Murder: The Twisted True Story Of A Wife, A Hidden Lover, And A Husband
Who Never Knew - Weird Darkness
Dolly Oesterreich, The Married Woman Who Kept Her Secret Lover In The Attic For 10 Years
— Even After He Killed Her Husband - NewsBreak
'Bat Man' Case: a Lurid Tale of Love and Death - Los Angeles Times