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After she survived, Craig ordered a rush shipment of potassium cyanide that he told the supplier was needed for a surgery, according to court documents.

Police said he lured his victims to his house for a daytime ritual, where he would then feed them drinks mixed with potassium cyanide and a sedative.

The records show authorities in December bought a brick of potassium cyanide, sodium hydroxide pellets and sulfuric acid for producing cyanide gas.

Perkovich said a discrepancy between the potassium cyanide obtained by corrections officials and the sodium cyanide called for under state execution protocol "is not a small detail."

The department bought a solid brick of potassium cyanide in December for $1,530.