S01E20 — The Ex-Files

A woman watches her partner get gunned down...and we next see her at the bar. She is Nick's ex-wife Lauren. A lawyer, she is pursuing an organ bootlegging case against a Dr. Julian Heller. Heller is an Immortal, who makes a huge profit on using his medical practices to corrupt purposes. He and Amanda had a run-in centuries ago when Amanda assisted as a midwife for a woman accused as a witch. Amanda escaped then and still holds a grudge, but Nick insists it is personal. He and Lauren briefly rekindle their romance, but Heller then has Lauren killed. Swearing revenge, Nick goes after Heller. Amanda gets there first, but is knocked down a flight of stairs and briefly killed. Nick arrives and drives off Heller before the latter can take Amanda's head. Nick takes Amanda's sword and goes after Heller with his gun. A game of cat & mouse ensues, but Nick gets the upper hand and takes Heller's head. Amanda arrives just in time to get the Quickening, leaving Nick to lament what might have been.