Authorities in western Iowa’s Audubon County say they may have identified the remains of an infant found last November. The Audubon County Sheriff’s Office says 22-year-old Kristen Stoberl of Ames has identified the remains as those of her stillborn son.

An anonymous tip alerted the Sheriff’s Office that Stoberl might be the mother of the dead baby. D-N-A samples have been taken from the remains, from Stoberl and from the reported father. Authorities say they’re waiting for the D-N-A tests to be finished before deciding on any charges.

The investigation has been ongoing since November Eighth, when trappers ran across the remains in an isolated area four miles southeast of Kimballton, in southwestern Audubon County.