Kaitlyn Dever Mourns Death of Mom from Breast Cancer: 'I Will Be Broken Forever Without You'

The actress's mom was diagnosed with stage 4 metastatic breast cancer 14 years ago when she was 39 years old

Kaitlyn Dever is mourning her mother Kathy, whom she called her "best friend," after she died from breast cancer.

On Wednesday, the 27-year-old Ticket to Paradise actress shared throwback photos of her mother on Instagram while writing about missing her late mom.

"My mama. My life. My everything. I don’t even have the words," wrote Dever. "Nothing I’ll ever say will amount to the gifts you have given me in my life, the boundless joy you brought, the deep, endless, unconditional love you gave me and our family."

"Your love was everywhere," she continued. "It was in the morning having coffee with you and shopping on the real real, it was sitting out by the pool eating watermelon (with salt on it of course) and listening to Willie Nelson, it was laying in your bed with you watching Seinfeld and listening to your infectious laugh as you recited every line from memory, it was making fun of each other, it was getting to tell you about my day, it was getting the best advice from you anyone would be so lucky to receive, it was going places with you because no matter where we were..we were having fun and laughing."

Related: Natasha Richardson's Son Micheál Watches His Late Mom's Films, Like 'The' 'Parent Trap', to Remember Her

The Booksmart actress said her mom's love "was like sunshine, warmed me when I needed it the most and made me smile when I was ever sad."

"You were everyone’s favorite. You are my favorite," wrote Dever. "The sweetest in the world. I will be broken forever without you and I don’t know how I’ll go on."

The Emmy nominee shared she'll have support in her dad and siblings Mady and Jane.

"We’ll always have each other to lean on because of you. You were the greatest mom and wife anyone could ever ever ask for," Dever wrote. "Thank you for fighting so hard for us for so long. I am forever, forever, grateful for the special time we got to spend with you, sweet mama…it will never be enough."

"I miss your smile, your sense of humor, your hugs, your kisses, getting to hold your hand, more than anything in the world," she added. "You made everything better. My sweetest, beautiful girl. My best friend. Oh how much I love you. What a gift it is to love you. I love you forever and ever, Mom."

Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories. 

Back in 2020, Dever wrote on Instagram about her mom "battling Stage 4 metastatic breast cancer for 10 years now." The star shared that Kathy was diagnosed at 39 and "every day since has been a terrifying battle."

"Some days are so so scary that I don’t even know how to feel anymore, and other days she has a positive appointment and then it’s a gooood day," she wrote at the time. "Every day is different and we’ve gotten through it together as a family."

The Unbelievable actress called her mom the "strongest woman I know and every day I am grateful for the doctors that have taken such good care of her over the years."

She added at the time, "Cancer is so unbearably scary. I can’t even begin to imagine what it’s like to live with this disease but I do know what it’s like to watch someone you love go through the pain. My heart is with anyone has to deal with the burden that is cancer. Let’s get checked and encourage those we love to get checked as well."

Dever's sister Mady wrote a tribute to their mom on Instagram Wednesday as well, saying, "Thank you for fighting so hard to stay here on this earth with us, for giving me my sisters and dad, and for being the most beautiful person inside and out that I will ever know. I love you endlessly."

For more People news, make sure to sign up for our newsletter!

Read the original article on People.