Who Is Liam On Sullivan’s Crossing? Discover Marcus Rosner’s Path to the Hit Series and His Impact on Season 4

Meet Liam Davies: A Game-Changing Arrival in Sullivan’s Crossing

Sullivan’s Crossing has never shied away from stirring the pot, but the introduction of Liam Davies at the end of season 3 truly left viewers on the edge of their seats. The sudden claim that Liam is none other than Maggie Sullivan’s long-lost husband reshapes the stakes for season 4. As the new episodes air, fans are eager to see how Maggie, brilliantly portrayed by Morgan Kohan, and her current flame Cal Jones (Chad Michael Murray) will navigate this emotional landmine. The show’s dynamic is also shifting after the departure of Scott Patterson, who played Harry «Sully» Sullivan, adding another layer of complexity to the story’s core family bond.

Marcus Rosner: The Star Behind Liam Davies

Stepping into the role of Liam Davies is Marcus Rosner, an actor whose face fans of TV drama and romance movies will immediately recognize. Born in Campbell River, British Columbia, Rosner has steadily built a prolific career across North America’s TV landscape. Early on, he snagged attention with a lead part in the network film Joey Dakota. From there, Rosner’s résumé quickly grew to include recurring roles on buzzy TV series such as When Calls the Heart, where he played Charles Kensington, the reality TV satire Unreal as Warren, and most notably, Ride as Austin McMurray. Even if you missed these performances, you might have caught him in high-profile guest spots on shows like Arrow, Supernatural, Once Upon a Time, and Girlfriends’ Guide to Divorce.

The Hallmark Universe & Beyond

If your weekends have ever featured a feel-good movie marathon, chances are you’ve seen Marcus Rosner’s work. His long-standing relationship with the Hallmark Channel has seen him starring in a string of beloved originals, such as A Christmas Detour, Yes, I Do, Appetite for Love, and Christmas in Evergreen. He’s the kind of actor who brings genuine warmth to every role, making him a fixture in not only Hallmark movies, but also titles from Lifetime, Great American Family, UpTV, and Prime Video.

• Prime Video Highlight: Watch Rosner in My Fake Boyfriend, where he stars as Nico, blending humor and charm in a digital-age romance setup.
• Hallmark Standouts: Rosner’s versatility shines in projects like Love on the Right Course, Falling Like Snowflakes, and Flipping for Christmas.
• Lifetime Thrillers: For fans of suspense, catch him in Infidelity in Suburbia and Killer in the Guest House.

In a neat twist for fans, Rosner previously shared the screen with Morgan Kohan in Hallmark’s Love on Harbor Island, setting up an undeniable chemistry that will surely spark in the drama this season on Sullivan’s Crossing.

Liam’s Return: The Tectonic Shift in Sullivan’s Crossing

With Rosner on board, the anticipation around Liam’s storyline in season 4 is palpable. Maggie’s love life, which she thought was settled with Cal, is suddenly thrown into turmoil with Liam’s surprise claim. The mystery amplifies with every episode: Are Maggie and Liam still legally married? Does Maggie harbor unresolved feelings for her enigmatic summer flame? The show drops tantalizing hints—Maggie, after all, once described her whirlwind romance with Liam as something every girl should experience. Through flashbacks and Maggie’s confessions, we learn about their fateful encounter in Europe and their abruptly severed connection when life pulled them in different directions.

Liam’s return is more than just a plot twist; it’s a test for Maggie’s priorities as she balances her medical career, the legacy of her family, and the tug-of-war between past regrets and new beginnings. With Cal discovering Maggie’s unsent letters to Liam, the love triangle is poised to intensify. The writers expertly keep viewers guessing about the ultimate outcome—will Maggie be swayed by old memories or commit to her new future?

When & Where to Watch

The emotional turbulence escalates every Monday at 8 p.m. ET on The CW, where Sullivan’s Crossing continues to deliver high-stakes heart and home drama. The addition of Marcus Rosner promises a fresh dynamic that veteran viewers and newcomers alike won’t want to miss as the drama unfolds this season.