K.J. Biermann, 15, pleaded not guilty Monday, Oct. 5, to seven felony charges in Fulton County Superior Court.

The charges stem from an alleged April 23 incident at the Life Time Fitness on North Point Parkway in Alpharetta. Biermann is the son of former Atlanta Falcons player Kroy Biermann and reality TV personality Kim Zolciak.

Attorney Jason Sheffield filed the plea on Biermann’s behalf and waived a formal arraignment scheduled for Oct. 14, according to Law Commentary’s report on the court filings. The defense is also seeking to move the case to juvenile court. No ruling on that request had been publicly reported as of Oct. 6.

A Fulton County grand jury indicted Biermann on Sept. 3 on one count each of aggravated child molestation, aggravated sodomy, aggravated sexual battery and false imprisonment, plus three counts of sexual battery against a child under 16.

The Alpharetta Police Department confirmed Biermann is being charged as an adult, FOX 5 Atlanta first reported in August. Arrest warrants state the alleged assault occurred in the family changing area of the gym. Authorities allege Biermann met a 15-year-old acquaintance in the facility's café before leading her to the changing area.

Sheffield told Page Six in September that the aggravated charges carry a mandatory minimum of 25 years in prison without parole if Biermann is tried as an adult.

"It is difficult to comprehend that a 14- or 15-year-old child can be held in detention for a month or longer simply waiting for a bond hearing," Sheffield told Page Six on Sept. 9.

Fulton County Superior Court Judge Melynee Leftridge set bond at $200,000 in September, with conditions that include electronic monitoring, virtual schooling, 24-hour house arrest and a ban on contact with the alleged victim or anyone under 16. No one under 16, including Biermann's younger siblings, may live in or visit the home, Complex reported.

Judge Leftridge denied a defense motion to close the courtroom, Page Six reported, finding the legal standard for closure had not been met. She did grant restrictions on media recording and photography and ordered Biermann's juvenile court records sealed.

Prosecutors filed an emergency motion Sept. 17 seeking court-ordered forensic interviews with additional minors, stating they had "a good faith basis for concern" about other minors connected to the case. No new charges were announced in that filing.

The defense has also requested more time to submit motions after receiving discovery materials. The judge ordered material submitted in three confidential filings sealed, according to Law Commentary.

The case remains pending.