Alvarado failed to say how she died.
Hobson launched the Fantastic Adventures YouTube channel, which garnered over 250 million views and introduced her seven adopted children.
with titles like "FLOOR IS LAVA!" and "Escape the Babysitter!" each episode featured children in lightsaber battles, becoming superheroes or trying to steal cookies.
But a welfare check in March found the home to be abusive.
Hobson would withhold food and water from the children for days, spray them with pepper, force them to take ice baths and lock them in a barren closet, according to a statement for probable cause.
CNN approached the Pinal County Prosecutor's Office for more information.