Michael E. Sindowski, 50.

A man was charged with drug-induced homicide for selling a substance containing fentanyl to a Crystal Lake man, causing his death in May, authorities said.

Michael E. Sindowski, 50, who is homeless, was charged with drug-induced homicide, a Class X felony, and unlawful delivery of a controlled substance, a Class 2 felony.

A criminal complaint filed in McHenry County court alleges Sindowski delivered a substance, which was less than 15 grams and contained fentanyl, to Mark R. Wiegert on May 7.

Wiegert, 49, of Crystal Lake, died a short time later as a result of him ingesting a portion of that fentanyl into his body, according to a Crystal Lake police detective who filed the complaint.

A motion filed by McHenry County Assistant State’s Attorney Kyle Bruett said that officers discovered a pill capsule containing fentanyl in Wiegert’s pant pocket when they found him.

An autopsy performed on Wiegert determined that he died as a result of adverse effects from heroin, fentanyl, acetyl fentanyl and alcohol.

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Detectives discovered a conversation between Sindowski and Wiegert where Sindowski was offering to provide the pill capsule containing fentanyl to Wiegert at the Convenient Mart in Crystal Lake, Bruett said.

Sindowski was arrested on the warrant on November 4 and remains held in the McHenry County jail on a $500,000 bond.

He is scheduled to appear in court on November 20 for a preliminary hearing.