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The boy, Billy Caldwell, suffers from status epilepticus, a kind of seizure that can last for hours.

His doctors think Daniel died of new onset refractory status epilepticus, or Norse, a rare seizure disorder in which healthy people with no history of epilepsy suddenly begin to seize uncontrollably.

Rare kinds of seizures known as status epilepticus last more than five minutes and may lead to brain injury when oxygen doesn't travel to the brain, he said.

Indeed, if left unchecked, seizure activity may lead to status epilepticus and death.

The drugs are commonly used to treat a potentially deadly prolonged seizure called status epilepticus.