Originally appeared on E! Online

Kelley Mack’s Walking Dead family is carrying on her legacy.

Hours after her sister Kathryn shared the heartbreaking news that the actress—known for her recurring roles as Addy on The Walking Dead, as well as her guest spots on 9-1-1 and Chicago Med— died at 33 following a battle with cancer , her former costars expressed their grief in the comments of the August 5 Instagram announcement .

Gustavo Gomez—Marco on TWD—expressed how grateful he was for the time they got to spend together on set.

“This is heartbreaking,” he wrote. “I feel so lucky that our paths crossed. Your bright light will aways shine on.”

Meanwhile, Anthony Michael Lopez (Oscar) commended Kelley for her strength while undergoing treatment for a rare form of cancer called diffus

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