LITTLE ROCK, Ark. (AP) — A drug wholesaler says it’s investigating whether a lethal injection drug Arkansas bought and had planned to use in a now-halted execution came from a pharmacy that it supplies, in violation of the company’s contract.

AmerisourceBergen said Tuesday it had not distributed midazolam to Arkansas’ Department of Correction, but was investigating the possibility it had sold the drug to a pharmacy which then sold the product to the state. A New York pharmaceutical company was revealed last week as the maker of the drug, even though the company said it doesn’t want its products used in executions.

Arkansas had planned to use the drug last week to execute convicted murderer Jack Greene, but the state’s highest court granted Greene a temporary stay.

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