Nathan Sweeney, 44, of DeKalb was charged with reckless homicide and DUI causing death in Deputy Christina Musil's death last month.
Illinois State Police said Sweeney was under the influence of drugs when the truck he was driving crashed into a parked squad car.
Sweeney was released from custody under conditions of the SAFE-T Act.
RELATED: Community honors fallen DeKalb County Sheriff's Deputy Christina Musil, remembered for service
Musil served in the sheriff's office for five years and also served in the Army National Guard. She leaves behind three young children.
RELATED | Truck driver charged with DUI, homicide in crash that killed DeKalb Co. deputy Christina Musil