Indiana's Department of Natural Resources announced Saturday that a duck hunter found human remains in a local marsh.

The hunter discovered a bone sticking out of the water as he was looking for a duck that he shot around 7 a.m. Saturday in the small town of Griffith, according to the department. The remains are believed to be six months old or older.

"Based on my experience and the condition of the remains, it appears the decedent passed away 6 months or longer, and a lot of time has passed since the occurrence," said Lake County Coroner David Pastrick in a release.

Indiana Conservation Officers and Griffith Police are investigating the discovery. The Lake County CSI and Lake County Sheriff Dive Team members are also working at the scene.

After hours of searching, officials discovered "many skeletal remains," according to the release.

The remains will be examined Monday by forensics and will later be sent for a more extensive exam.

Griffith is located about 32 miles south of Chicago.