Christopher Sepulvado, an 81-year-old Louisiana death row inmate convicted of brutally killing his 6-year-old stepson, died of natural causes Sunday, a month before his scheduled execution by nitrogen gas.

Sepulvado, who recently had a leg amputated due to gangrene, would have been the first person executed in Louisiana in 15 years.

His attorney called the planned execution “barbaric,” the New York Post has reported.

Written by B.C. Begley