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.

Massachusetts State Police forensic expert reveals the potential blood samples in red Solo cups that Canton police collected were never tested.

Yuri Bukhenik, lawyers, including WBZ's legal analyst Katherine Loftus, became increasingly skeptical that prosecutors might not call key witnesses in their case against Karen Read. Those witnesses are Brian Higgins,

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.

Yuri Bukhenik, a Massachusetts State Police trooper, read dozens of text messages between Karen Read and Brian Higgins, an ATF agent.

To put a label on the whole thing, my opinion is that she’s trying to get revenge,” Massachusetts State Police Sgt. Yuriy Bukhenik testified Friday.

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

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.

A number of key witnesses have yet to take the stand in the high-profile case, on topics ranging from DNA evidence to data from Read’s car.

Brian Higgins, a special agent with the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF), had sent ‘flirtatious’ messages to Karen Read