The signatures of Adolph and Louise Luetgert, taken from a court document.

Adolph and Louise Luetgert's marriage certificate.

Cook County Coroner's Inquest Record into the death of Hugh McGowan, which Luetgert was rumored to have a hand in.

Adolph Luetgert's 1892 building permit to construct his factory.

A facsimile of a letter Luetgert wrote to Christine Feld. Chicago Tribune, Sept. 5, 1897.

Adolph Luetgert's entry in the Joliet pentientiary ledger, Page 1.

Adolph Luetgert's entry in the Joliet pentientiary ledger, Page 2.

A Cook County court document from June 1899, showing Diedrich Bicknese (Louise Luetgert's brother) winning guardianship of Adolph Luetgert's children.

A July 1899 court record, showing Diedrich Bicknese failed to appear in court and lost guardianship.

A facsimile of an affidavit by a Cook County Jail inmate claiming that Luetgert confessed. Tribune, July 31, 1899.

Cook County Coroner's Inquest Record into the death of criminologist J. Sanderson Christison.

Cook County Recorder of Deeds ledger showing transactions for the Luetgert factory property.

The Commission on Chicago Historical and Architectural Landmarks' report on the former Luetgert factory.

The burial of Luetgert's son Max at Waldheim Cemetery in 1875.

The burial of Luetgert's wife, Caroline, at Waldheim Cemetery in 1877.

The death certificate for Luetgert's daughter Louise from 1881.

The burial of Luetgert's daughter Louise at Waldheim Cemetery in 1881.

The burial of Luetgert's son Elsa at Waldheim Cemetery in 1889.

The burial of Adolph Luetgert at Waldheim Cemetery in 1899.

Death certificate of Luetgert lawyer Lawrence Harmon, showing he died at a mental hospital.