Ms Cartwright's brother Ben has penned a heartbreaking tribute to Nicole.
"Rest in peace my little sister. I love you with my all," he said.
"It is with very sad and heavy hearts that we announce our beloved daughter, sister and friend Nicole Cartwright has sadly passed away," he continued. "Details at this stage will not be discussed. Thank you for all the love and support we have received from family and friends over the last few days."
According to police Ms Cartwright lived with her parents in Lansvale.
Detectives from the homicide squad are investigating Ms Cartwright's death.