13-year-old YouTube star dies suddenly 'of natural causes'

Fans are mourning the tragic death of 13-year-old Caleb Logan Bratayley, best known for his family's YouTube channel "Bratayley."

In case you're not familiar with the Logan family, Caleb and his sisters Annie and Hayley are popular YouTube vloggers. They have over 1.5 million fans who tune in to watch their family antics online, including a recent "History in a Hot Tub," complete with colonial style costumes. 

Caleb also had his own YouTube channel devoted to MineCraft with over 100,000 followers. 

Caleb's mother announced the news on Friday via Instagram. 

Here's her post.

 And here's the caption:

Yesterday at 7:08PM Caleb Logan Bratayley passed away of natural causes. This has come as a shock to all of us. Words cannot describe how much we will miss him. His incredibly funny, loving and wonderful spirit made us all fall in love with him as a YouTuber, friend, brother and son. We know you tune in to watch each day and eagerly anticipate new videos, but ask that you bear with us while we deal with this tragedy as a family. Please help us honor our, baked potato.

On Saturday, Caleb's family uploaded a video entitled "Dear Future Self," which was filmed the day before Caleb died. 

"Unfortunately Caleb passed away the day after we made this video. He will never get to meet his future self. None of us will and we are very sad because he would have been great. Please kiss your kids and tell them you love them every day. You never know what day will be their last," reads an on-screen message at the end of the video.

Since learning of Caleb's death, fans and fellow YouTubers have expressed their sympathies. 

"Praying for @Bratayley & crying over the loss of Caleb," family YouTuber Shay Carl tweeted. 

On Sunday, the Logan's uploaded a tribute video for Caleb to the Bratayley channel. You can watch that here or below.