I am not a lawyer, but my understanding is that mentioning what we have read or viewed in the media is unlikely to be deemed prejudicial to a case, as the jury is very likely to have seen the same reports and they are in the public domain. In any case, TV channels and most MSM will have had lawyers scrutinise all aspects of what they have said, and will be certain that it would stand up in court.
If someone knew a victim and gave information that is not in the public domain, it would be different, as would someone saying things that have not been previously published (good or bad) about the defendant.
Maybe a lawyer could confirm, though?