Testimony is continuing in the murder trial of Karen Read, who is accused of backing her SUV into her Boston police officer boyfriend, John O’Keefe, and leaving him for dead. On Monday, Prosecutor Adam Lally called two DNA analysts before calling a digital forensics examiner to the stand.

Here’s a look at a timeline of the entire case, from the key 6-hour period surrounding O’Keefe’s death and the ensuing legal battle over who is responsible.