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George Preston Marshall, owner and founder of the Boston Braves sought to rename the franchise in 1933 after leaving the stadium they shared with the baseball team of the same name. Marshall was said to have named the Redskins in honor of Dietz, who claimed to be of the Sioux Nation, by analogy with the Red Sox who shared the team's new home, Fenway Park. A 1933 news article quotes Marshall as saying he named the team because of real Indians on the team. However, Marshall is only talking about why he specifically chose Redskins. Dietz was hired before the name change and is cited in many articles and by Marshall as being a reason he kept the Native American theme when changing the team name.
Historian Linda M. Waggoner has traced Dietz' heritage in several articles in Indian Country Today Media Network and at a 2013 symposium at the National Museum of the American Indian. He was born William Henry Dietz, or “Willie,” on August 17, 1884, in Rice Lake, Wisconsin, at 16 West Humbird Street. His father William Wallace Dietz, settled in the area in 1871 and was elected county sheriff in 1877. He married Leanna Ginder in November 1879. "Willie" attended Oklahoma’s Chilocco Indian Agricultural School, where it is likely he feigned some kind of Indian identity for the first time. As Waggoner wrote, "Naturally, visitors to the St. Louis World’s Fair exhibit, including Dietz’s future wife, Winnebago artist Angel De Cora (1871-1919), thought Dietz was a Chilocco student."
In 1921, Dietz took a coaching position with Purdue University in Indiana. After Angel De Cora died in 1919, He married Doris O. Pottlitzer, a middle-aged local journalist, on January 29, 1922. The week previous to their marriage, Purdue officials fired him for illegal recruiting. In spring 1933, George Preston Marshall, owner of the Boston Braves, hired Dietz to replace Coach Lud Wray. In 1937, the team moved to Washington, D.C.
For the rest of his life, Dietz continued to promote himself as Lone Star Dietz, the son of W.W. and Julia One Star of Pine Ridge. He took on his last coaching job in 1937 for Albright College in Pennsylvania; in 1964, still married to Doris, Dietz died in Reading, Pennsylvania. He and Doris were so poor that former teammates purchased his headstone. It reads: “William ‘Lone Star’ Dietz born in South Dakota.”
Dietz named himself "Lone Star" after James One Star, the alleged nephew of an Oglala Buffalo Bill Performer sometime after the 1904 St. Louis World's Fair. "Lone Star" and "One Star" are the same name in Oglala.
Dietz's Indian heritage was first contested in 1916 after former neighbors who settled on the Pacific Coast heard he was posing as an Indian. In December 1918 the Federal Bureau of Investigation looked into his heritage after he fraudulently registered for the draft as a "Non-Citizen Indian" with an allotment. The Bureau found he had taken on the identity of James One Star, an Oglala man of the Pine Ridge Indian Reservation 12 years his senior who had disappeared in 1894. Dietz also falsely claimed he was the head of an American film company that produced propaganda films for the war.
Dietz divorced De Cora in November 1918, charging her with abandonment. It is not clear how much she knew about his true identity. She died six days after his indictment.
Dietz was tried in Spokane, Washington in June 1919 for the first offense. One Star's sister, Sallie Eaglehorse, testified after seeing him for the first time at the trial that Dietz was definitely not her brother. Still, the judge instructed the jury to determine whether Dietz "believed" he was an Indian, not whether it was true. Despite that others had witnessed his birth in the summer of 1884 or had seen him the following day, Dietz's mother Leanna claimed he was the Indian son of her husband who had been switched a week or more after she had a stillbirth. Dietz's acting ability along with his mother's fallacious testimony (to protect him from prison) resulted in a hung jury, but Dietz was immediately re-indicted. The second trial resulted in a sentence of 30 days in the Spokane County Jail after he pleaded "no contest".