Originally appeared on E! Online

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

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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.

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

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