Expert witness in Karen Read murder trial caught with 'errors' inflating his credentials

Massachusetts murder suspect Karen Read returned to court Monday for her trial in the death of her former boyfriend, Boston Police Officer John O'Keefe, as DNA experts and a digital forensic scientist testified for the prosecution, linking the victim to a lone hair sample found on Read's SUV and tightening up a timeline surrounding the final moments of his life.

But under cross-examination, a witness with key new evidence for the state revealed what appears to be an exaggerated resume.

O'Keefe, 46, was found dead on Jan.