She checked into a room at the Edgewater Beach Hotel where he was staying and invited him to her room.
“We’re not acquainted, but I have something of importance to speak to you about,” she wrote in a note to him after a game at Wrigley on June 14, 1949.
It worked. Waitkus arrived at her room. After he sat down, Steinhagen walked to a closet, said, “I have a surprise for you,” then turned with the rifle she had hidden there and shot him in the chest. Theodore wrote that she then knelt by his side and held his hand on her lap. She told a psychiatrist afterward about how she had dreamed of killing him and found it strange that she was now “holding him in my arms.”
Newspapers devoured and trumpeted the lurid story of a 19-year-old baseball groupie, known in the parlance of the day as a “Baseball Annie.” Among the sensational and probably staged photos was one showing Steinhagen writing in her journal at a table in her jail cell with a framed photograph of Waitkus propped nearby.
A judge determined she was insane and committed her to a mental hospital. She was released three years later, after doctors determined she had regained her sanity.
Details about the rest of her life are sketchy. She lived with her sister in a house just a few miles from the hotel where she shot Waitkus. A neighbor told Theodore that Steinhagen said she worked in an office for 35 years but never revealed her employer. And she made an effort to conceal her privacy, often refusing to answer the phone or come to the door when Theodore knocked.
Chris Gentner, a neighbor who used to help the Steinhagen sisters with chores, said he only found out who she was 15 years after they began living nearby.