The DNA of the Suspect in the Murder of Madison Morgan and Kaylee Gonzalez

A Washington State University grad student was arrested in Pennsylvania on first degree murder charges in last month’s killing of four University of Idaho students in their off-campus home. Sources tell CNN authorities zeroed in on 28-year-old Bryan Kohberger after tracing his ownership of a white Hyundai Elantra seen in the area of the killings and unknown DNA through genetic genealogy. CNN Chief Law Enforcement and Intelligence Analyst John Miller tells AC360 if its critical for investigators to find the murder weapon.

Plus, New York Times investigative reporter Russ Buettner joins AC360 to discuss the key takeaways from former President Trump’s tax returns.

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