CORALVILLE, Iowa (AP) — Authorities say a man has died while serving a life sentence for killing a 2-year-old girl more than 40 years ago in Waterloo.

The Iowa Corrections Department said Monday that 71-year-old Russell Fitz died Sunday at the Iowa Medical and Classification Center in Coralville. He'd been assigned there because of his chronic illness.

Fitz was charged with first-degree murder for the slaying of Michelle Day in June 1974. A detective found her body in a crawl space over Fitz's apartment bathroom. She'd been strangled.