SPANAWAY, Wash. -- Following a nearly two year investigation, a Spanaway mother is charged in the death of her toddler.

Alyia Iverson is accused of allowing her two-year old son to ingest THC and enough meth to kill an adult at their Spanaway home in December 2012. Alyia Iverson is now facing a manslaughter charge.

Investigators said Iverson watched as her son drank bong water and didn't call 911. With the amount of drugs he had in his system, they say he would have shown signs of distress including fever, convulsions and seizures.

Relatives like cousin Krista Leonard said the family tried to warn the state by contacting the Department of Social and Health Services multiple times. Neighbors like Jessica Rooney, who has lived on 6th Avenue East in Spanaway for eight years, said she saw the warning signs before the toddler died.

(I) had seen Nathan around a few times before he passed away and his condition as far as kids-wise was not good at all, said Rooney. He was a very loving child, but he was reaching out for some attention.

DSHS conducted a review of the case following Nathan's death. The agency concluded that more could have been done to engage with the family and check on Nathan's condition among other findings.

Prosecutors said Nathan and his sister had been removed from Iverson's home in 2011, but she was able to regain custody.

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