Prosecutors are aiming to chip away at Dr. Marie Russell's credibility and keep her off the witness list for Karen Read's retrial.

Dr. Marie Russell previously testified that the holes found in John O’Keefe’s hoodie and the wounds to his arm were from a dog.

A retired California-based doctor who testified as an expert witness for the defense in Karen Read's first trial will be back on the stand Tuesday. Prosecutors are trying to exclude future testimony from Dr.