AJ Battaglia said detectives informed his family that his 33-year-old sister Brittany Battaglia was found dead in an apartment.
"I am absolutely heartbroken to share this. Brittany was such kind person and didn't deserve this. She was the best sister I could ever ask for," AJ said on social media.
Brittany was last seen on Friday and a missing persons report was filed. She lived in the 1900 block of North Kimball Avenue in the Logan Square neighborhood.
Police said a person was found dead around 8:33 p.m. Monday in a residence one block to the north of Brittany's home.
Brittany Battaglia | Chicago Police Department
An autopsy found Brittany had suffered "multiple incised wounds" and her death was ruled a homicide, according to the Cook County medical examiner’s office.
She was last seen Friday heading to her boyfriend’s home down the street from where she lived, according to her family. When she did not return home, her roommate alerted her brother AJ, who said he woke up the rest of the family.
The brother pleaded for information over the weekend, sharing missing person alerts across social media. He said concern grew when Brittany never boarded a flight she had scheduled Monday for a work trip to California.
Brittany grew up in the northwest suburbs but had lived in the city for the past three years. She worked as a cosmetologist and esthetician but was also an artist, according to her family.
"She was a happy person," AJ told the Sun-Times. "She was loved by all."
No charges have been announced against the suspect, who was arrested in 2009 and charged with aggravated criminal sexual assault and attempted murder. He entered a guilty plea in 2011 but details were not immediately available in court records.
Sun-Times Media Wire contributed to this report.