Seven people, including two 12-year-old boys, have been charged with first-degree murder in the death of a 38-year-old man on a northern Alberta reserve.

Five of those charged, ranging in age from 12 to 18, will appear in court Tuesday, in connection with the slaying of Rocky Moyah.

Moyah's body was discovered Friday near a back road on the Frog Lake First Nation, about 275 kilometres northeast of Edmonton.

An autopsy conducted Monday showed Moyah died from blunt force trauma.

In addition to the 12-year-old boys, a 15-year-old boy and two 16-year-old boys have been charged in the killing.

Two 18-year-old males also face murder charges.

The seven accused are all from Frog Lake.

Police won't discuss the circumstances surrounding the slaying, but say the reserve does not have a history of violence.

Results of an autopsy conducted Monday have not been released.