Logan Williams, who the role of a young Barry Allen on the popular Hollywood TV series, The Flash, has passed away. He was just 16 years old.

The official cause of his death is not public yet, according to Hollywood Reporters.

Meanwhile, Grant Gustin, popular for playing role of the older Flash has taken to social media to mourn him.

“Just hearing the devastating news that Logan Williams has passed away suddenly,” Grant Gustin wrote.

“This picture was early in the filming of The Flash pilot episode back in 2014. I was so impressed by not only Logan’s talent but his professionalism on set.

“My thoughts and prayers will be with him and his family during what is I’m sure an unimaginably difficult time for them.

|Please keep Logan and his family in your thoughts and prayers during what has been a strange and trying time for us all,” he added.

In addition to portraying the childhood version of The Flash, Williams also appeared in Lifetime’s period drama When Calls The Heart, the 2015 Supernatural episode “Plush” and ABC’s horror-mystery series The Whispers. His first role was in the 2014 television movie The Color Rain.