Authorities say they were called to a home on Westbend in Ames around 10:30 p.m.
Witnesses say 38-year-old Devlin Lockman accidentally shot himself in the head with a semi-automatic 9mm handgun. He was rushed to Mary Greeley Medical Center where he was pronounced dead.
Police have not filed charges. At this point they are calling it a tragic accident.
The case is still under investigation.