The physical evidence against Adnan Syed was scant - a few underwhelming fingerprints. So aside from cell records, what did the prosecutors bring to the jury, to shore up Jay's testimony? Sarah weighs all the other circumstantial evidence they had against Adnan, including curious behavior, a disconcerting note, and an unexplained mid-afternoon phone call.

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Adnan once issued a challenge to Sarah. He told her to test the state’s timeline of the murder by driving from Woodlawn High School to Best Buy in 21 minutes. It can’t be done, he said. So Sarah and Dana take up the challenge, and raise him one: They try to recreate the entire route that Jay said he and Adnan took on January 13th, 1999.

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A few days after Hae’s body is found, the detectives get a lead that opens the case up for them. They find Jay at work late one night and bring him down to Homicide. At first, he insists he doesn’t know anything about the murder. But eventually he comes clean. He tells them what happened on January 13th. A few weeks later, he’s back at Homicide and his story has changed. In some ways, these changes are small and understandable. In other ways, they’re big and confounding.

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It’s February 9, 1999. Hae has been missing for three weeks. A man on his lunch break pulls off a road to pee, and stumbles on her body in a city forest. His odd recounting of the discovery makes Detectives Ritz and MacGillivary suspicious. For instance, why did he walk so far into the woods - 127 feet - to relieve himself? And that’s just the start. A look into the man’s past reveals some bizarre behavior.

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Their relationship began like a storybook high-school romance: a prom date, love notes, sneaking off to be alone. But unlike other kids at school, they had to keep their dating secret, because their parents disapproved. Both of them, but especially Adnan, were under special pressure at home, and the stress of that spilled over into their relationship. Eventually Hae broke up with Adnan. And then, depending on who you ask, Adnan was either understandably sad and moping around, or full of rage and plotting to kill her.

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It's Baltimore, 1999. Hae Min Lee, a popular high-school senior, disappears after school one day. Six weeks later detectives arrest her classmate and ex-boyfriend, Adnan Syed, for her murder. He says he's innocent - though he can't exactly remember what he was doing on that January afternoon. But someone can. A classmate at Woodlawn High School says she knows where Adnan was. The trouble is, she’s nowhere to be found.

Our newest podcast, “The Good Whale,” is out now. Search for it wherever you get your podcasts, or follow it here: https://lnk.to/good-whale

To get full access to this and other Serial Productions and New York Times podcasts on Apple Podcasts and Spotify, subscribe at nytimes.com/podcasts.

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