Walburga Oesterreich (née Korschel; 1880 – April 8, 1961), nicknamed "Dolly" and "Queen of Los Angeles", was a German-born American housewife, married to a wealthy textile manufacturer Fred William Oesterreich (December 8, 1877 – August 22, 1922), who gained notoriety for the shooting death of her husband and the subsequent bizarre revelation that she had kept her lover, Otto Sanhuber, hidden in the attic of the home she shared with her husband for ten years.

It is unclear if she herself was born in Imperial Germany or shortly after her parents arrived in the U.S. She grew up in the Milwaukee, Wisconsin area among a community of fellow German immigrants.

[2][3] Gradually, the need to conceal the relationship from both Fred and the neighbors led to Sanhuber's moving into the Oesterreichs' attic, which was accessible through a panel in the ceiling of the closet of the bedroom Walburga shared with her husband.

During the day he would perform housework in the residence; at night he would live in total silence in the attic, reading and writing science fiction stories, which Walburga would mail to potential publishers for him.

On August 22, 1922, after overhearing a loud argument between the Oesterreichs and believing Walburga to be in danger, Sanhuber emerged from the attic and retrieved two .25 caliber pistols from the bedroom bureau.

[3] Upon being summoned by neighbors who reported the gunshots, the police, unaware of Sanhuber's presence in the house, strongly suspected Walburga's involvement in the murder but were unable to explain how she could have locked herself into the closet.

A neighbor also told police that Walburga had given him yet another pistol shortly after the murder, asking him to dispose of it because it too closely resembled the gun that killed her husband and she "did not want to get into trouble."

Upon knocking on the trapdoor leading to the attic, he was greeted by a thin, pale, but cordial Sanhuber, who explained his true relationship with Walburga and eventually confessed to his role in the murder.

[3] He changed his name to Walter Klein and moved to Canada, where he married another woman, then eventually relocated back to Los Angeles and lived the remainder of his life in obscurity.