Trial 4

As the voters of Suffolk County prepare to elect their next district attorney, Scapicchio digs into who funded the reward for Ellis' conviction.

Knowing it's his last chance, Ellis nervously prepares for a fourth murder trial. Also, an investigator searches for an old witness.

Ellis' attorney, Rosemary Scapicchio, remains dogged in her pursuit of the missing documents that may hold the key to her client getting a new trial.

Journalists expose corruption in the Boston Police Department, inspiring Ellis to seek a new trial and perhaps a new lawyer.

As Ellis and his lawyers recount his first jury trial, former jurors share their decision processes. A witness's statements are put to the test.

Police home in on a suspect, a 19-year-old named Sean K. Ellis. Boston journalists and cops recall another murder case that fanned racial tensions.

In 1993, the execution-style killing of a Boston police officer sets off a frantic citywide search for suspects.