Lilley posted a heartfelt goodbye to the show onInstagramon September 19.

“Last week of me exploring this girl’s shenanigans on screen,” she wrote.

I have enjoyed every moment of her hilarious sass and ferocity, layered with brokenness."

Days of Our Lives' Jen Lilley smiling

But her gratitude didn’t stop at what the character meant to her.

Her caption continued with, “To the cast and crew at @dayspeacock, I love you forever.

You’re my family.

Days of Our Lives' Theresa Donovan smiling

You are never beyond redemption.

You are called by grace and marked with love.

Thank you for supporting me on this decade-long journey.”

“It was so wonderful to see you back in Days!”

responded one avid fan, who continued with, “Like a family reunion seeing y’all all together!

Wish you all the best with life & will continue to follow your posts.

I’m disappointed that Days is replacing you.”

Many echoed the sentiment that Lilley’s portrayal of Theresa is the definitive version of the character.

One response exemplified the fan love, stating, “We will miss you.

There is only one Theresa.”