AceShowbiz - Sullivan's Crossing season 4 introduces a dramatic twist with the arrival of Marcus Rosner as Liam, the secret husband of Maggie, played by Morgan Kohan. This reveal adds a new layer of complexity to the popular drama, which has been streaming on Netflix since August 2025.

In season 3, viewers first heard about Liam when Maggie mentioned him to Lola (Amalia Williamson) as a brief romance from her past before she completed medical school. The pair had a sweet meet-cute while Maggie was abroad, but they eventually lost contact. Later in the season, Cal (played by Chad Michael Murray) discovers letters Maggie wrote to Liam, where she explains why their relationship could not continue, emphasizing her dedication to her career.

The season primarily focused on Maggie and Cal’s evolving relationship. Although they were not officially a couple, they faced several emotional hurdles, including Cal’s reunion with his estranged father, who was suffering from a terminal illness. This subplot added depth to Cal’s character and influenced his interactions with Maggie.

As season 3 concluded, Maggie supported Cal through his difficult family reunion and returned with him to Sullivan’s Crossing. Cal then asked Maggie to move in with him, and they began planning a future together. However, the season finale shocked fans when a guest who had checked into their lodge earlier revealed himself to be Liam, claiming to be Maggie’s husband. This unexpected revelation sets up a suspenseful storyline for season 4.

The new season, which premiered on The CW on April 20, promises to delve deeper into Liam and Maggie’s backstory through flashbacks, giving fans insight into their romance before Maggie moved to Canada. This narrative device will provide context for Liam’s sudden appearance and its impact on the current relationships.

Before joining Sullivan's Crossing, Marcus Rosner had built a solid acting resume with roles in shows like UnREAL, Arrow, Supernatural, and Once Upon a Time. He is also well-known for his frequent appearances in Hallmark movies, including titles such as Autumn In the Vineyard, Love on Harbor Island, Romance to the Rescue, Flipping for Christmas, Love on the Right Course, and Falling Like Snowflakes.

Regarding his personal life, Rosner announced his engagement to longtime girlfriend Alison Kroeker in December 2020. The couple married a year later and welcomed their first child in January 2026.

Co-star Morgan Kohan shared her thoughts on the surprise twist involving Liam during an interview with Swoon in July 2025. She revealed that she had only a vague idea about Liam’s character early in season 3 but did not know he was Maggie’s husband until the cliffhanger was introduced. Kohan mentioned that Maggie’s hesitation about committing to Cal likely stems from her complicated past with Liam, which adds emotional layers to her character’s development.

Kohan also admitted she was as much in the dark as the audience regarding Liam’s full backstory and significance in season 4. She hinted at upcoming conversations between Maggie and Cal that will explore trust issues caused by Maggie keeping Liam a secret.

Showrunner Roma Roth teased the dramatic impact Liam’s arrival will have on the series. Speaking to Collider in July 2025, Roth emphasized the importance of conflict and emotional tension in a romance drama. She described a “pretty big shoe drop” at the end of season 3 that sets the stage for season 4’s storyline, which will explore themes of second chances and emotional healing.

Roth explained that season 3 aimed to give characters an opportunity to explore love and navigate their emotional journeys, balancing heavier themes with moments of hope and positivity. This approach allows the show to maintain emotional depth while offering viewers moments of levity and optimism.

As season 4 of Sullivan's Crossing unfolds, fans will be eager to see how Liam’s presence challenges Maggie and Cal’s budding relationship. The show promises to explore trust, past secrets, and emotional reconciliation in the rural Nova Scotia setting that has captivated audiences.

With Marcus Rosner bringing Liam to life and a strong ensemble cast led by Morgan Kohan and Chad Michael Murray, Sullivan's Crossing continues to deliver engaging drama, complex relationships, and heartfelt storytelling that keep viewers coming back season after season.