Defense in Karen Read trial proposes that Boston Police Officer John O'Keefe's death might be linked to a "jealousy"-fueled fight with ATF agent Brian Higgins.

Text messages between defendant Karen Read and ATF agent Brian Higgins are essential to understanding the theories behind both the prosecution and defense’s case.  Read all of them here.

Karen Read exchanged flirty texts with another man two weeks before her cop boyfriend was found murdered, according to testimony Friday.

Video played for jurors in the Karen Read trial shows Brian Higgins at the Canton police station on the night John O'Keefe died, Massachusetts State Police Sgt. Yuri Bukhenik testified.

Karen Read pleaded not guilty to murder charges in the death of Boston police officer John O’Keefe and is facing a retrial after a jury was unable to reach a verdict last year.

Yuri Bukhenik, a key investigator in the Karen Read case, is back on the stand Monday for a third day of cross-examination from defense attorney Alan Jackson as the trial enters its fourth week.You can watch testimony live on CBS News Boston by clicking on the video player above.

Jurors saw John O'Keefe's clothes and learned why leaf blowers and Solo cups played a critical role in the investigation.

Karen Read defense attorney Alan Jackson grills MSP Sgt. Yuri Bukhenik about the behavior of ATF Agent Brian Higgins on surveillance video at a bar less than an hour before John O'Keefe's death.