An autopsy has confirmed a Kansas man whose body was found in his car after being there for up to three months committed suicide.

The Hutchinson News reports the Sedgwick County Regional Forensic Science Center filed an autopsy report this week saying 54-year-old Adam Sabri had high levels of an allergy medication in his system and died of diphenhydramine toxicity.

The Wichita man was reported missing on Feb. 9 but not found until a resident of an apartment complex in Maize complained to police about a foul odor outside of his building.

Sabri’s body was identified by dental records. An apparent suicide note was found inside the car.