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One week after Jansen Panettiere’s death, his family revealed that the voice actor passed away from natural causes.

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In a statement to ABC News, Panettiere’s family — including his sister, actress Hayden Panettiere — said that Jansen died from “a cardiomegaly (enlarged heart), coupled with aortic valve complications.”

“Jansen’s heart could be seen in his eyes, and his charm in his brilliant, engaging smile; his soul in his masterful and revealing paintings, and the joy of life in his dry wit. … His charisma, warmth, compassion for others, and his creative spirit will live forever in our hearts and in the hearts of all whom he encountered,” the family said.

Jansen Panettiere, voice actor, brother of Hayden Panettiere, dies

According to the Mayo Clinic, an enlarged heart isn’t a disease itself, but rather points to another condition. The condition can be caused by heart damage or certain types of heart disease.

“We sincerely appreciate the outpouring of love and support towards our family as we navigate this unthinkable loss, and ask that we be gifted our privacy during this time of mourning,” the family’s statement read. “We love you so much and you will be in our hearts forever.”

Jansen worked as an actor and had multiple credits to his name on “Even Stevens,” “The Walking Dead” and “How High 2.”