The Karen Read trial​ is back in a Massachusetts courtroom today with testimony from a crash reconstructionist.

Karen Read's defense team has sought to prove that she was framed for the death of her cop boyfriend John O’Keefe.

Karen Read’s defense team called one of their key experts to the stand today. Watch court live in the player below. Get up to speed with what and who to know in the trial with our guides. Daniel Wolfe is the chief of crash reconstruction for an engineering consulting firm called ARCCA.