IOWA CITY, Iowa (AP) — Johnson County authorities say an accident killed a 26-year-old man whose body was found in an Iowa City creek.

The medical examiner’s office says Jonathan Guerrero died of blunt force head injuries and likely drowning. His body was found in Ralston Creek the morning of July 1. Police say evidence supports the medical examiner’s preliminary results.

Authorities are still investigating the death of 45-year-old Eric Riskedahl, whose body was found under a U.S. Highway 6 bridge in Iowa City later on July 1. Police say the investigations so far don’t find any connection between the two deaths and say crimes are not suspected in either of them.