Pittsburgh Press, February 19, 1913:

Lost: One Indian warrior belonging to the Giants. Jim Thorpe, who was baptized Drags-His-Root by his aboriginal daddy, has disappeared.
...
Jim was scheduled to join the main party of Giants in Harrisburg Sunday evening, but missed connections. The Olympic hero then was expected in St. Louis, but he was not there when the train pulled out last night. McGraw, who has not said so, seems very anxious to locate him.

They eventually found him, obviously. Even in ...

El Paso Herald, January 29, 1913:

Effort is being made by the Chicago White Sox, the Cincinnati Reds and the St. Louis Browns to secure the services of [Jim] Thorpe.

Toledo News-Bee:

Garry Herrmann is almost sure that Jim Thorpe…will join the Cincinnati club. It is perfectly natural the Indian should go with the Reds.

Richmond Times Dispatch:

It was learned yesterday on what is believed to be reliable authority that James Thorpe…is under contract to the Pittsburgh National League baseball club to ...

Jim Thorpe’s admission of having played professional baseball, Pittsburgh Gazette Times, January 27, 1913:

I played baseball at Rocky Mount and at Fayetteville, N.C. in the summer of 1909 and 1910 under my own name…I did not play for the money there was in it because my property brings me enough to live on, but because I liked to play ball. I was not very wise in the ways of the world and did not realize this was wrong…
...
I have always liked sport and only played or run races for the fun of ...

Pittsburgh Gazette Times, January 25, 1913:

A charge that James Thorpe, the world’s greatest athlete, was a professional baseball player two years before he entered the Carlisle Indian school was laid before James E. Sullivan, secretary of the Amateur Athletic Union [yesterday].

The charge originated with Charles Clancy, manager of the Winston Salem club, Carolina Association, who told the sporting editor of the Worcester Daily Telegram that the Indian played for his team as a pitcher and first ...

Toledo News-Bee, January 24, 1913:

That Jim Thorpe, the Carlisle Indian athlete who won the title of world’s all-round champion athlete in the Olympic meet in Sweden last summer, is a professional, is charged by a Carolina league baseball man. Thorpe’s accuser claims he has proof Thorpe played professionally in the Carolina league.

Ruh roh.