Why picture a White woman in an article about a crime committed by a non-White? Because they know it leaves the impression that Whites are also criminals, and they cannot be accused of "racism" reporting crimes committed by aliens.
For this same reason, when on infrequent occasion a news report containing black-on-white crime is reported, television news producers usually have a black or other non-white reporter present the story.
The original story is found here: State of Massachusetts caught using falsified lab tests in convictions; thousands exonerated after fake science exposed, or click here for a screenshot.