Prosecutor Nick McLeland told the jury on Friday that they would be shown graphic crime scene photos during the trial, Fox 59 reported. Police claimed at the time of Allen's arrest that they had searched his home and found several knives and a gun that was allegedly linked to a bullet found at the scene, according to the AP.

Years after Libby German and Abby Williams went missing, a trial in their deaths has started. What to know about Richard Allen and the Delphi murders.

Testimony in the murder trial of Richard Allen, accused of the brutal killing of two teen-age girls in 2017, began in Delphi, Ind. NBC News' Maggie Vespa reports.

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Twelve jurors and four alternates were chosen Monday and Tuesday in Fort Wayne, Indiana, to hear Richard Allen's trial in the 2017 killings of 13-year-old Abigail Williams and 14-year-old Liberty German.