Investigation into the death of nuclear laboratory worker Melissa Casias continues as authorities and commentators discuss new information linked to her case. According to coverage from multiple outlets, a missing skull connected to Casias has been reported as providing a new clue in understanding how she died. One article also highlights commentary from a former FBI agent who raises a specific theory about the circumstances of her death. The reporting describes the latest developments as part of an evolving inquiry and notes that external expert views are being shared alongside the ongoing investigation.

While the details emphasized by outlets vary in how they present interpretations, the core points remain that Casias is a nuclear lab worker whose death is being investigated, that her case includes elements of missing remains, and that a newly identified skull is being treated as relevant to investigators’ understanding. The former FBI agent’s theory is presented as an allegation or hypothesis rather than established fact in the reporting provided.