A trailer for Spot Free Cleaning was found on the property.
According to a criminal complaint, Neumann's wife told police that the morning of Jan. 2, she went to Neumann's black Ford F-150 and found a man slumped over in the passenger's seat, bleeding and showing no signs of life, the Milwaukee Journal Sentinel reported. Neumann's daughter told police that later that morning she overheard him telling his wife he shot a man "over a pack of squares," a reference to a pack of cigarettes.
The complaint said Neumann was assisted in buying burning materials from the roommate of one of the victims, the Journal Sentinel reported.
A Facebook account appearing to belong to Neumann shows a public image of a Nazi SS symbol, described by the Anti-Defamation League as a symbol of white supremacy, WISN-TV reported.