The report says a woman went back to Castro's apartment after having some drinks and woke up to him taking advantage of her after she had blacked out.
It says that when she woke up she screamed and yelled at her alleged attacker, and left the apartment at about 5:30 a.m. getting a ride home from her friend. It would be 12 hours before the alleged victim would go to a hospital, and police would become involved.
By then, it is believed that Castro was on a plane, heading home to the Dominican Republic for the off-season.
Castro's departure explains why the investigation is still ongoing and was not resolved when first brought to the attention of the police last fall.
Players are starting to get back into baseball mode with just over a month until pitchers and catchers report to spring training, so the police are waiting to speak with Castro about the incident. Paul Kinzer, who is the Cubs star's agent, didn't comment in the WBBM report.
The team also hasn't released any statements about the situation as everybody involved is likely still gathering information before going public. It's obviously a shocking development that involves Chicago's most talented young player, so they are going to get all the facts before taking the next step.
It's important to remember that Castro hasn't been charged with any crimes yet. The police are just awaiting a chance to speak with him to get his side of the story about what happened last September.
The 21-year-old Castro is entering his third season with the Cubs and there haven't been serious character issues in the past.