Sabrina was acutely aware of the risks associated with conducting a private investigation to uncover the truth about her father's death.

If what she was doing was exposed, she might get killed.

Although she was unsure who was responsible for her father's murder, she knew that she needed to prepare for any eventuality.

If she got killed, her investigation would come to light.

Another scenario could be that Darren uncovered a lead, yet the case remained uninvestigated due to procedural constraints or the interference of a mole.