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Actor Logan Williams, who appeared in CW’s The Flash as the young Barry Allen, has died. He was 16.

Williams’ agent, Michelle Gauvin, says he died Thursday. Gauvin did not give the cause of his death, but she said his sudden death comes as a “shock.”

The Flash star Grant Gustin posted a photo of him with Williams and actor Jesse L. Martin on Instagram that was taken during the filming of a series pilot in 2014. Gustin called the news of Williams’ death “devastating” then spoke highly about his talent and professionalism.

John Wesley Shipp, who played Barry Allen in the CBS version of The Flash, posted photos with Williams on Twitter. Shipp said he was “heartsick” after hearing the news.

Williams started acting at the age of 10. He appeared in other television shows, including When Calls the Heart and The Whispers.