Through dozens of hours of security footage, Allegheny County detectives tracked the movements of everyone who went into 66-year-old Faith Henley’s North Braddock apartment over two days in October.

Detective Nicole Grimm said that everyone who entered the apartment at any point after 8 p.m. on Oct. 9 left by 5:30 a.m. Oct. 11 — the last time cameras captured Ms. Henley alive outside her fourth-floor apartment. The only person they couldn’t account for, she testified Friday, was Victor Cordero.

The cameras throughout the Shady Park Place apartments showed Mr. Cordero, 28, coming and going from the complex several times during those nearly two days. He was inside Ms. Henley’s apartment when she left briefly and then returned for the last time.

The next time anyone went into or out of the

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