(Lake County, IL) A woman has been charged with the Class X felony of Drug-Induced Homicide in connection with a fatality stemming from fentanyl use in Lake Forest.

In July 2023, Lake Forest Police responded to a residence following a report of an apparent overdose. The victim was pronounced dead at the scene. The Lake County Coroner’s Office determined the cause of death was “fentanyl toxicity.”

Following a comprehensive investigation by the Lake Forest Police Department, with assistance from the Drug Enforcement Administration (DEA), authorities reviewed phone records and determined that the victim had arranged to buy fentanyl from Mercedes Tello, 48, just before the victim died. Investigators also learned that the victim had an ongoing history of purchasing drugs from Tello.

After reviewing the facts of the case, the Lake County State’s Attorney’s Office approved one count of Drug-Induced Homicide, a Class X Felony, and arrest warrant was issued. Tello appeared in court on July 18, for her First Appearance hearing.

Lake County State’s Attorney Eric Rinehart stated, “Fentanyl, heroin, and other drugs are killing people in every community in Lake County. We must compassionately provide treatment to those in need, innovatively engage in harm reduction to save lives, and investigate, arrest, and incarcerate those who cause the death of others by dealing these drugs.”

Lake Forest Police Chief John Burke said, “This case reflects the hard work and persistence of our officers and partners at the DEA. We will continue to do everything we can to seek justice for victims and hold drug dealers accountable for the harm they cause.”

State’s Attorney Rinehart added, “The Lake Forest Police Department and the DEA did a fantastic job, and this investigation shows that we will find those who cause the death of someone through drug dealing – no matter how long it takes.”

The State has filed a petition to detain, and a detention hearing is scheduled for July 18, 2025, at 1:30 p.m.