LAWRENCE, Kan. (AP) — An autopsy report of a man found along Kansas 10 in Douglas County shows he died from an overdose of a prescription antipsychotic medication.

The Lawrence Journal-World reports 37-year-old Nathan Thurman was prescribed the antipsychotic drug at a state hospital before his death in July. Lawrence police found an empty bottle of the Quetiapine tablets inside his bag. They say he filled the prescription five days before his death and that the drugs should have lasted one month.

Douglas County Coroner Erik Mitchell says Thurman had a toxic concentration of the drug in his blood. The report didn’t state if the overdose was intentional.