• Hayden Panettiere's brother Jansen is dead
  • He died at just 28 years old
  • This was his cause of death

So far, Jansen's cause of death was unknown. Now Hayden Panettiere and her family are making it public in a statement. The family told ABC News that, according to a coroner's report, Jansen died of cardiomegaly, an enlargement of the heart.

The Panettieres are in the grieving process

This happened because of complications of the aortic valve. In the statement, Hayden Panettiere, her mother Lesley and father Skip also share emotional words about Jansen with these words: 

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"You could see Jansen’s heart in his eyes, his charm in his brilliant, engaging smile, his soul in his masterful and insightful paintings and the joie de vivre in his wry wit," the statement read...

Watch the video above to learn more!