Authorities in Pontiac are investigating the death of a 30-year-old man whose body was found in a park after he left home to walk his dog and didn't return.

Livingston County Chief Sheriff's Deputy Marvin Rutledge says Ryan Bertsche went out with his French bulldog Sunday. When he didn't return home, his wife reported him missing.

Livingston County Coroner Michael Burke says the runners found Bertsche's body Monday on a trail in an area called Humiston Woods. There's no word yet on what caused his death.

Authorities say Bertsche didn't have any known health problems and his wallet was found in his locked car at the park.