A Vermont man charged with killing his son on the first day of spring turkey hunting season has pleaded not guilty.

Forty-five-year-old Kevin Kadamus, of Lyndon, entered his plea Monday to a manslaughter charge.

Kadamus' brother-in-law Tom Loftus says Kevin will suffer for the rest of his life for accidentally shooting his 17-year-old son, Jacob, on May 1. The family calls it a hunting tragedy.

Police say it is a tragedy, but the law doesn't provide exemptions when family members are involved. They say the father violated an important rule of hunting by not identifying his target before shooting.

The St. Johnsbury courtroom was packed with about 150 supporters of Kadamus.