The 16-year-old was walking home from work when she was shot in the head on the 2400 block of S Rockwell St.
Angie's mother, Maria Monroy, is pleading for any leads in her daughter's murder.
"If someone saw something, please say it don't be scared. The police will be on your side. Please say something, do not stay quiet," said Monroy.
RELATED: Family of Little Village teen Angie Monroy fatally shot in December leading weekend walk, vigil
The walk started at Benito Juarez Academy and ended where Angie's life was taken.
Joselyn Monroy, Angie's sister, said their fight isn't over until they see justice served.
"We're not going to stop until we find answer of who did this," said Monroy.