Who Is Maggie's Secret Husband on 'Sullivan's Crossing'? Meet Marcus Rosner
Marcus Rosner plays a pivotal role on season 4 of Sullivan's Crossing as Maggie's secret husband, Liam.
Season 3 of the hit series, which started streaming on Netflix in August 2025, initially hinted at Maggie's (Morgan Kohan) ex when she mentioned Liam (Rosner) to Lola (Amalia Williamson) as a summer fling she had met before finishing medical school. After a meet-cute while on a trip abroad, Maggie and Liam fell out of touch.
Liam was brought up again when Cal (Chad Michael Murray) found letters Maggie had written to Liam explaining why their relationship couldn't work long-term because she wanted to prioritize her career.
The rest of the season focused on Maggie and Cal's relationship. Despite them not being an official couple, they faced several challenges, including Cal reconnecting with his estranged father who was battling a terminal illness.
After Maggie supported Cal through the difficult reunion, they returned to Sullivan's Crossing, where he asked her to move in with him. They started planning their future just as the season came to an end, which is when a guest who checked in earlier that day revealed himself to be Liam. He then shocked Cal by referring to himself as Maggie's husband.
Season 4, which premiered on The CW on Monday, April 20, will feature flashbacks that offer more insight into Liam and Maggie's romance before she moved to Canada. Keep scrolling for everything to know about Rosner:
What Did Marcus Rosner Star in Before ‘Sullivan's Crossing'?
Showrunner Roma Roth teased what the newcomer's arrival meant for Maggie and Cal.
"There's never a dull moment at Sullivan's Crossing," Roth told Collider in July 2025. "A romance drama series needs to have push and pull between your characters … we're going to have a pretty big shoe drop at the end of the season that we'll get to see play out in season 4."
Roth said she wanted season 3 to reflect the theme of "second chances," sharing, "These characters have been through a lot over two seasons. We wanted to give them an opportunity to explore love. I think that's what we actually even called one of the scripts."
Roth concluded: "Because we're dealing with a lot of emotional issues we wanted to have some lightness and levity this season, by giving people a reprieve and having them have some hope and positivity in their lives. Continuing the journey from the head to the heart - with emotion and drama and a few surprises."
How Has Marcus Rosner Transitioned From Acting?
In addition to being in front of the camera, Marcus Rosner has directed and written for projects as well.
"I've been fortunate to have a really privileged career both in front of the camera and as a producer, but in many ways it feels like all of that has been building toward stepping into the director's chair," he told The Northern Arizona Times in April 2026. "Acting is still my favorite part of the process, those moments between action and cut, but directing offers a different kind of creative fulfillment. Having that level of control keeps you engaged and creatively stimulated throughout the entire day, and that's something I've found myself really craving."
He added: "My background has been incredibly valuable in that transition. Acting gave me a deep understanding of performance, while producing taught me how films actually come together. Together, those experiences made stepping into writing and directing feel grounded and intentional. I have a clearer sense of what's achievable, what's interesting, and how to shape a visual and tonal language that feels specific to me."
Copyright 2026 Us Weekly. All rights reserved
This story was originally published April 20, 2026 at 7:01 PM.