Sarah Koenig stated a claim of definition here along with in the rest of this podcast I believe. In this sentence see makes a clear thesis of what happened to Hae Lee, and expands from there. This statement is a fact in which she forms her opinions around it throughout the rest of the episodes. She defines what she thinks happened and her opinion around the facts of the case. She also defines the "non facts" or the information that was basically just filled in by either her thoughts, assumptions that the detectives made, or conclusions that the juror made about what happened that day, the motive, and what type of person Adnan was. It's good to start out with a claim of definition. It fills the audience in on valuable information they will need to hang on to for the rest of the episodes, so they can decide whether or not Sarah's claims are valid or not. If the audience doesn't fully understand Sarah's thesis behind her podcast, they will either become uninterested in what she has to say or they will discredit her work all together which as a reporter is never good.