Patrick Muldoon's former co-stars have paid tribute to the star following his sudden death.

The veteran soap actor passed away on Sunday (19.04.26) at the age of 57 after suffering a heart attack and his work colleagues have been left stunned by the news.

Former 7th Heaven star Jeremy London wrote on X: "Wtf is happening?!? I just worked with Patrick."

Dean Cain starred with Patrick in the Dog Who Saved Christmas film series and paid tribute to his friend.

Alongside praying and broken heart emojis, he simply wrote on X: "RIP, my friend."

Child actor Jake Getman lamented the fact the Melrose Place star was "gone too soon".

He wrote on Instagram alongside a photo of them together: "RIP Patrick Muldoon. Worked with him when I was 8 on Little Dead Rotting Hood -- a great guy and always kept the energy light. #gonetoosoon.(sic)"

Alison Sweeney described the death of her Days of our Lives co-star as "heartbreaking".

She wrote on X: "This is such heartbreaking news. Pat was a rare kind of person--brilliantly talented, endlessly kind, and generous in spirit. I was so lucky to have worked with him when I first started at Days, he made me feel at ease right away. He brought his unique charm and humor to work every day. A truly gifted guy, and one who will be profoundly missed.(sic)"

The Starship Troopers actor - who is survived by partner Miriam Rothbart, parents Deanna and Patrick Sr., and sister Shana - was remembered as "endlessly generous" by his friends.

His pals told Deadline: "[Patrick] loved animals and people alike, gave unforgettable hugs, and possessed a rare quality of making others feel safe and seen.

"Stylish, charismatic, and full of life, he embraced each day with a full-tilt, rock 'n' roll spirit."

Patrick's sister, Shana Muldoon-Zappa, previously told TMZ her brother was taking a shower when his partner found him unconscious on the bathroom floor but paramedics were unable to revive him at the scene.

Patrick grew up in California and started acting in college, landing a role in sitcom Who's the Boss? and appearing in teen show Saved By the Bell for three episodes shortly after he graduated in 1991.

The actor went on to land his role as Austin Reed on hit soap Days of Our Lives, staying with the show between 1992 and 1995 and returning for a second stint from 2011 until 2012.

In the mid-1990s he went on to star in Melrose Place as villain Richard Hart from 1995 until 1996.

He scored numerous movie roles over the years appearing as Zander Barcalow in Starship Troopers in 1997 and landing a role in 1999's Stigmata, while more recently he appeared in Deadlock in 2021 with Bruce Willis and in 2022 Liam Neeson film Marlowe, which he also produced.

Last year, he teased soap fans about a possible return to his soap roots by hinting he could be returning to Days Of Our Lives.

In a video posted on the Peacock network's social media platforms, Patrick was seen walking around backstage looking for the soap's studio before realising he was in the right place and declaring: "Oh my God I'm in Salem! It's good to be back".

His latest movie, Dirty Hands, was due to be released later this year.