Lisle man gets 9 years in prison for drug-induced homicide

  • Adam P. Roser

    Adam P. Roser

Updated 6/21/2022 3:23 PM

A Lisle man was sentenced to nine years in prison Tuesday for killing a Darien man by providing him fentanyl-laced heroin, on which he overdosed.

Adam Roser, 38, will have to serve at least 85% of his sentence before being eligible for parole. He will receive credit for the 2¾ years he has been in the DuPage County jail since his arrest in October 2019.


DuPage County Judge Margaret O'Connell pronounced the sentence.

Roser pleaded guilty earlier this month to drug-induced homicide for the Aug. 2, 2019, death of Andrew Sasnau, 19. Sasnau died in the living room of his phone.

Police found text messages between Sasnau and Roser on Sasnau's phone, setting up the drug purchase. After the sale, Roser texted Sasnau to ask him about the quality of the drugs. When Sasnau replied that they were good, Roser replied, "Thanks. I mixed them up myself," a prosecutor said at Roser's bond hearing in 2019.

Roser pleaded guilty in 2013 to aggravated battery and, in a separate case, possession of a controlled substance. He was sentenced to 18 months in prison. In a 2010 case, he pleaded guilty to possession of ketamine, a hallucinogenic anesthetic.

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