In many cases, they are. But sometimes, there might be a bit of dramatization or creative liberties taken to make the story more engaging for the audience. However, the core elements are usually based on facts.
True crime shows aim to present true stories. They do a lot of research and draw from actual police reports, court documents, and interviews. But keep in mind that for entertainment purposes, some details might be emphasized or presented in a certain way.
Yes, for the most part. True crime shows are typically based on real-life events and cases that have actually occurred.