People v. Landerman — Illinois appellate court revives young-adult sentencing challenge

Case
The People of the State of Illinois v. Adam M. Landerman
Court
Appellate Court of Illinois, Third District
Judge
Justice Peterson; Justice Holdridge; Justice Davenport
Date Decided
October 15, 2026
Docket No.
3-25-0107
Topics
Postconviction relief; Young adult sentencing; Proportionate penalties; Mandatory life sentence
Source
Read the full opinion

Background

Adam M. Landerman was convicted of two first-degree murders and received a mandatory natural-life sentence for killings committed when he was 19. The evidence showed that Landerman participated in a planned robbery, restrained one victim while another participant attacked the other victim, and later helped move the victims’ bodies and obtain materials for their disposal.

Landerman had no criminal record and a history of bipolar disorder, ADHD, childhood trauma, substance abuse, and self-harm. In his postconviction petition, he submitted a developmental-psychology report stating that his conduct reflected immature impulsivity, vulnerability to negative peers, and incomplete brain development. The Will County circuit court dismissed the petition at the second stage.

The Court’s Holding

The appellate court affirmed dismissal of Landerman’s Eighth Amendment claims. Miller v. Alabama’s constitutional rule against mandatory life without parole for juvenile homicide offenders does not apply to offenders who were 18 or older, the court held.

But the court reversed dismissal of Landerman’s Illinois proportionate-penalties claim and remanded for further proceedings. Taking the well-pleaded allegations as true at the second stage, the petition made a substantial showing that Landerman’s youth-related characteristics could place him in the same developmental category as juvenile offenders and that he received mandatory life without sentencing consideration of those characteristics. An evidentiary hearing is needed to develop the facts bearing on whether the sentence is unconstitutional as applied.

Key Takeaways

  • Illinois’s proportionate-penalties clause can support a young-adult sentencing challenge even though Miller does not extend under the federal Eighth Amendment to offenders age 18 or older.
  • At the postconviction dismissal stage, courts must accept unrebutted well-pleaded facts and may not make credibility determinations or resolve factual disputes.
  • Evidence of trauma, mental-health history, brain development, peer pressure, culpability, and rehabilitation potential can warrant an evidentiary hearing on an as-applied challenge to mandatory life.

Why It Matters

The decision reinforces that emerging-adult defendants may pursue Illinois constitutional challenges to mandatory life sentences when they allege individualized youth-related characteristics comparable to those underlying Miller. It does not hold Landerman’s sentence unconstitutional; it holds only that his claim must proceed to an evidentiary hearing.

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