Rachelle Lefevre Under the Dome and Ian Lake (Rookie Blue) have joined the cast of Lifetime’s euthanasia-themed drama series Mary Kills People as series regulars for the upcoming second season.

Mary Kills People centers on Mary Harris (Caroline Dhavernas), a single mother who is an ER doctor by day — but by night, she and her partner, a former plastic surgeon, moonlight as underground angels of death helping terminally ill patients slip away on their own terms. Lefevre will play Olivia Bloom,a mysterious woman with ties to Mary’s past. Lake will play Travis Bloom, Olivia’s husband.

In the new season of Mary Kills People, Mary (Dhavernas) plummets deeper into the criminal world as she searches for a steady supply of pentobarbital, the highly regulated and highly lethal “death drug.” As she becomes more entangled in her illegal work, Mary continues to risk her family and ER doctor career as she tries to keep her worlds separate. But when the mysterious Oliva Bloom (Lefevre), approaches Mary and her partner Des (Richard Short) with a lethal request — and when Mary crosses unexpectedly with Detective Ben Wesley (Jay Ryan) — she realizes her secrets can only be hidden for so long.

Season one of Mary Kills People is currently available on Hulu. Production on season two is about to begin in Toronto for a 2018 debut on Lifetime.