TOPEKA, Kan. (AP) — Relatives of a man who died while serving a life sentence for killing a northeast Kansas woman are seeking $1 million in damages and threatening to file a lawsuit.

The family of Roger Hollister sent letters last month to the Kansas Department of Corrections, the Nemaha County Attorney’s Office, the Atchison County Sheriff’s Office, the Kansas Bureau of Investigation and a former prison health care contractor.

The letters allege that infirmary staff at the El Dorado Correctional Facility failed to adequately treat Hollister before the 61-year-old died March 20. He was convicted in 2011 of first-degree murder in the death of 58-year-old Patricia Kimmi, of rural Horton.

Kimmi disappeared in November 2009, and her remains weren’t found until May 2010.