The victim has been identified as Marina Aksman, 50. Her car -- a silver 2009 Nissan Rogue with license plate number 4219607 -- is missing.
Police are searching for two persons of interest: Kristina Aksman, the victim's 20-year-old daughter, and Kristina's boyfriend, Daniel Baker, 21. Officials said Kristina Aksman takes medication for mental illness, but would not comment on the type.
Police were called to the home at 1848 Olympic Drive, which is located in a development called Greg's Landing, after a car crashed into it. That car is registered to Baker's mother, but police believe he was driving.
Authorities found the victim's body at approximately 5 a.m. Thursday in a first floor bedroom of the home. According to Lake County Coroner Dr. Richard Keller, Aksman was pronounced dead at 6:30 a.m. inside her home.
Autopsy results confirm homicide; Aksman died of blunt trauma to the head. Authorities say no other significant injuries to her body were found. Police have found what they believe may be the weapon, but would not say what that is.
"We know that this was not a random act. We have two persons of interest that we are looking for," said Sgt. Jason Zimmerman of the Vernon Hills Police Dept.
Neighbors told ABC7 Chicago they were concerned.
"I'm surprised, very surprised. In this day and age, nothing should surprise anybody any more," said neighbor Nancy Kramer.
"It's scary that it happened in Vernon Hills, which is usually a quiet community. I'm thinking that it's someone the person knows. Otherwise, it's scary," said Robin Tecktiel, also a resident.
Police are asking anyone with information on the whereabouts of the persons of interest or the car is asked to call 847-362-4449.
The car that was slammed into the house is registered to a woman in Deerfield. However, some in the neighborhood reportedly say they have seen the car before, and it is believed to be Baker's car.