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REDMOND, Wash. -- The King County Sheriff's Office said a 12-year-old boy died after he accidentally hung himself on a zipline.

The boy was identified as Jackson Roos.

Spokesperson Cindi West said the accident happened at the boy's home in the 8800 block of 255th NE just outside of Redmond.

West said the boy had been playing outside. The boy's mother thought he was riding his bike, but he was in the backyard on the zipline. After looking for him, she found him hanging on the zipline.

Medics responded to the scene and attempted to resuscitate the boy but he was pronounced dead at the scene.

Detectives said the zip line appeared to be commercially made and installed.

It's not known how the boy was caught up on the line. Detectives are investigating whether the helmet the boy was wearing was hung up or another line used to sit in while zip lining became entangled.

Jackson Roos is the second child to die from accidental strangulation in less than a month.

The little girl from Sammamish that had a jump rope and somehow got strangled. These things don't happen intentionally, they happen quickly and you know accidents happen, said West.

This is terrible, said West. Our hearts go out to the family ... and the first responders that come here. This isn't something anybody wants to experience, whether you're a family member or police officer or firefighter so it's just tragic all the way around.

KING 5's Elisa Hahn and Liza Javier contributed to this report.

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