Influencer Lizzie Kieffer and her family are grieving the unexpected death of their 1-year-old daughter.
Kieffer, who posts as @doclizziedpt, has grown a social media following as a physical therapist, sharing pelvic floor workouts for expectant mothers, as well as prenatal and postpartum fitness programs. She has nearly 300,000 followers on Instagram.
Kieffer, who is currently expecting another baby, made the heartbreaking announcement about her daughter Lilian Louise Kieffer in an Instagram post over the weekend.
"We are shattered," Kieffer wrote in the statement.
Kieffer said she and her family awoke on April 23 to find that Lilian, whom they call Lily, had "passed away," adding that the family later learned the 1-year-old had a "large mass on her brain."
"We also have come to learn that Lily had a large mass on her brain that we could have never known about as she never showed signs," she wrote. "We won't know more answers with many of these things for months until further testing is done."
Kieffer called Lilian, who had just celebrated her first birthday on April 13, the family's "angel." In the post's caption, she wrote that the toddler "taught [them] more in 1 year than most can in their life."
"You will always, always be a part of us and although the hole will never be filled, speaking your name will sing through our days bringing joy into the moments," Kieffer wrote. "You're our light in this darkness and we know God is holding you in an extra special place."
An obituary for Lilian also described her as "Daddy's girl," adding that the young girl loved "climbing into the ball pit" and "riding around in her little red car" with her older sister Mia, 2.
Kieffer and her husband Matt Kieffer are expecting a third child in September.
ABC News has reached out to Kieffer for comment.
