Foul play is not suspected in the death of 13-year-old YouTube star Caleb Logan Bratayley, the Anne Arundel County Police Department in northern Maryland said via People magazine. However, the cause of death remains a mystery.

When the fire department and authorities arrived at the scene, "nothing appeared to be criminal, nothing was suspicious and there was no foul play," Ryan Frashure, director of media relations for the AACPD, told People. The boy was taken to the hospital and pronounced dead on arrival.

Caleb’s mother, Katie Bratayley, wrote in an Instagram post Friday that her son died on “natural causes.” But she didn’t elaborate what happened -- that’s because the cause and manner of death was being investigated, Bruce Goldfarb, public information officer for the state medical examiner's office in Baltimore, told People.

A source told TMZ that Caleb’s death was not a result of suicide. Because an autopsy was underway, a cause should be revealed soon.

The YouTube star’s family was in shock after their loss. “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,” Caleb’s mother wrote.

Sadly, Caleb’s death wasn’t the only tragedy the Bratayley family has suffered. In 2013, cousin David Cooper unexpectedly died at age 10. The medical examiner determined David's cause of death was suicide by hanging, People wrote in a different article Monday.

The YouTube channel that made the family famous, “Bratayley,” has over 1.6 million subscribers and more than 1.26 billion views. The channel also stars Caleb’s sisters: Annie, 10, and Hayley, 7. The family said they were going to take a break from making videos to mourn Caleb.

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