This article contains spoilers for the four-part HBO documentary “The Case Against Adnan Syed.”

Did Adnan Syed kidnap and murder his ex-girlfriend and high school classmate Hae Min Lee in 1999? A Baltimore County jury in 2000 decided he did. Millions of listeners to the podcast “Serial” haven’t been so sure.

Viewers of Sunday night’s finale of the four-part HBO documentary “The Case Against Adnan Syed” will continue to wonder. But they will do so armed with new facts. Chief among them: A series of new forensic tests found no traces of Syed’s DNA on the many samples taken from Lee’s body and car during the original investigation.

The series’s director, Amy Berg, made good on HBO’s promise to deliver big revelations on a 20-year-old murder case that “Serial” made famous starting in 2014. Like the podcast, the HBO series offered no definitive statements about Syed’s guilt, but it did raise numerous questions about the methods and conclusions of the state.

What’s next? Whatever happens will arrive in a context very different from the one Syed faced less than a month ago, when the highest court in Maryland denied him a retrial, overturning the decisions of two lower courts. Here’s a quick look at the finale’s major revelations.