SIOUX CITY (AP) — A woman fighting the early release of her sister’s killer from an Iowa prison said she thinks the man is being wrongly categorized as a low-risk prisoner, and she has asked the governor to intervene.

Beth Williams has written to Gov. Terry Branstad and local officials in an effort to keep Brian Davis in prison. Davis was convicted in 1995 of second-degree murder in the death of Williams’ sister, Julie Baack.

Williams said she understands that overpopulation may have led to the approval of Davis’ early release, but she’s concerned he’s being wrongly defined as a low-risk prisoner.