Twenty-year-old Eric Johnson is being held in connection with the 18-year-old's death and was in court Monday afternoon.
Johnson is charged with unlawful delivery of a substance but police have not explained how the charges are related to her death.
She was found after an accident near 115th and Beloit Avenue in Worth.
"Just like to ask anybody else with any information leading up to the cause of my daughter's death to please come forward. And just ask the community, everybody, just to say prayers," said Brittany's father, Patrick Wawrzyniak.
The Wawrzyniak family tells Eyewitness News her death was not an accident and that she was beaten and tossed out of a car.