People v. Thompson, 2022 IL App (1st) 200463

In October 1994 Phillip Thompson (age 18) shot and killed David Grover; Thompson was convicted of first-degree murder and sentenced to 80 years’ imprisonment.
Thompson had earlier juvenile/adolescent offenses and a separate 1995 conviction for a 1992 murder (when he was 15) that resulted in concurrent long terms after resentencing.
Thompson’s 2019 pro se postconviction petition argued Miller v. Alabama protections should extend to some young adults (citing brain‑development research) and that his 80‑year term is a de facto life sentence violating the proportionate penalties clause.
The trial court summarily dismissed the petition as frivolous; the appellate majority affirmed, holding Thompson’s eligibility for day‑for‑day good‑conduct credit means his earliest release is after 40 years, so his 80‑year term is not a de facto life sentence under Buffer and Dorsey.
The court also rejected counting mandatory supervised release (MSR) toward the de facto life calculation and held the sentence did not shock the community’s moral sense under the Illinois proportionate‑penalties clause.
A dissent argued the summary dismissal was premature because (1) prison infractions could jeopardize full good‑credit eligibility (making the effective term >40 years) and (2) Thompson’s as‑applied proportionate‑penalties claim deserved second‑stage development.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Whether Thompson’s 80‑year term is a de facto life sentence in violation of Miller/Eighth Amendment	People: No — Thompson is eligible for day‑for‑day good‑conduct credit, so earliest release is after 40 years; Buffer’s >40‑year line applies only where no good‑credit reduces time.	Thompson: Yes — scientific evidence shows emerging‑adult brains resemble juveniles; Miller protections should apply to some over‑18s and 80 years is functionally life.	Held: No — because of statutory day‑for‑day credit Thompson can obtain release after 40 years, Dorsey controls and his sentence is not a de facto life term under Buffer.
Whether Thompson’s sentence is unconstitutional as‑applied under the Illinois proportionate penalties clause	People: No — given the brutal facts, legislative sentencing norms, and the opportunity for release after 40 years, the sentence is not so disproportionate as to shock the community.	Thompson: Yes — as an 18‑year‑old with mitigation and scientific support, the 80‑year term is disproportionate and denies meaningful hope for rehabilitation.	Held: No — on the record the sentence does not shock the moral sense; the Miller line does not extend here and Thompson’s as‑applied claim fails at the first stage.

Miller v. Alabama, 567 U.S. 460 (2012) (mandatory life without parole for juveniles unconstitutional; sentencing must account for youth characteristics)
Montgomery v. Louisiana, 577 U.S. 190 (2016) (Miller requires a meaningful opportunity for release based on demonstrated maturity and rehabilitation)
People v. Buffer, 2019 IL 122327 (Illinois Supreme Court: juvenile prison terms over 40 years constitute de facto life sentences)
People v. Dorsey, 2021 IL 123010 (Illinois Supreme Court: day‑for‑day good‑conduct credit can provide meaningful opportunity for release and prevent a term from being de facto life)
People v. Holman, 2017 IL 120655 (Illinois Supreme Court: Miller reasoning applies to discretionary life sentences for juveniles)
People v. Harris, 2018 IL 121932 (Illinois Supreme Court: extension of Miller protections to young adults is premature without developed factual record)
People v. House, 2021 IL 125124 (Illinois Supreme Court: reaffirmed Harris — as‑applied Miller claims require developed record/factual findings)
People v. Reedy, 186 Ill. 2d 1 (1999) (truth‑in‑sentencing amendments are not retroactive)