Season 3 - Downton Abbey -

: The season ends on a bittersweet note as Mary gives birth to a healthy son and heir. However, while driving home in high spirits, Matthew is killed in a sudden car accident—a twist necessitated by actor Dan Stevens' departure from the show. Life Below Stairs

: In one of the show's most heartbreaking moments, Lady Sybil dies shortly after giving birth to her daughter due to eclampsia. Her death leaves the family in deep mourning and creates a long-lasting rift between Cora and Robert over his medical decisions. Downton Abbey - Season 3

: Lord Grantham reveals that the family’s fortune was lost due to a bad investment, putting the entire estate at risk. : The season ends on a bittersweet note