WARNING! This article contains SPOILERS for Dexter: Original Sin season 1, episode 6!Harry’s flashbacks are gradually leading up to the tragic death of Dexter’s biological mother, Laura Moser, and Dexter: Original Sin season 1, episode 6 makes the circumstances of her demise more brutal than before. In Dexter season 1, it was reveled through his interactions with the Ice Truck Killer that Dexter’s mother was horribly murdered at a shipping yard on the orders of drug lord Hector Estrada, with young Dexter being found by Harry in a pool of her blood. However, it wasn’t until the Ice Truck Killer taunted Dexter with details about Laura’s death that he finally remembered it.

https://screenrant.com/dexter-original-sin-laura-moser-death-more-brutal-explainer/