Abby Stevens (Roxy Sternberg) is Boyd's wife, who was killed early in Season 1 during one of the first monster attacks. the show's most significant early death precisely because it removes the emotional anchor that might have kept Boyd stable. Her loss defines Boyd's entire arc: his search for a way out is inseparable from his guilt about not being able to protect her. Ellis, their son, carries that loss quietly while Boyd carries it loudly. The show has used Abby's memory as a structural weight more than a plotline, but her absence keeps returning in ways that suggest the town has not fully released her.
The community has a low-but-persistent theory that Abby, like Jim, may be accessible through the town's apparition mechanic. No direct confirmation. Her early death was also structurally unusual for a show that tends to kill characters when their arc is complete. Abby's arc felt unfinished. This sits in the same unresolved space as the Jim ghost question: is Fromville done with Abby, or is it still using her?