As a result, the Georgia Bureau of Investigations couldn't retrieve any evidence from the recordings, according to the attorney.
More on Roethlisberger
"The DVD system overwrote itself," said Carl Cansino, attorney for the Capitol City nightclub in Milledgeville. "Had it just been deleted, they might have been able to save some of it."
No cameras were pointed at the staff restroom where the alleged incident took place in the early hours of March 5, Cansino told the Tribune-Review.
Cansino said a member of Roethlisberger's entourage recorded his own video inside the nightclub, where the quarterback and eight to 10 friends went to celebrate his 28th birthday. According to Cansino, the footage shows Roethlisberger with his accuser around the time of the incident.
Authorities say they have interviewed everyone in Roethlisberger's group -- including Steelers offensive tackle Willie Colon -- with the exception of the quarterback himself. Georgia police confirmed to the Tribune-Review that Roethlisberger hasn't spoken to authorities other than a brief interview with Milledgeville detectives in his home 30 miles away from town.
Pittsburgh television station KDKA reported Wednesday that Roethlisberger's accuser has declined to speak with investigators since the night of the incident and skipped a scheduled meeting last week. One source told KDKA that the investigation appears to have hit a brick wall.
Cansino told the Tribune-Review that he gave authorities copies of a fake driver's license that Capitol City nightclub bouncers confiscated from Roethlisberger's accuser weeks before the alleged incident.
Cansino also said authorities told him the woman's blood-alcohol level was above 0.20 percent -- more than 10 times the legal limit for drivers younger than 21 in Georgia -- the night of the alleged incident. Cansino said he believes the woman obtained the alcohol from patrons, not nightclub employees.
Roethlisberger also is facing a lawsuit in Nevada after a woman accused him of raping her in 2008 at a Lake Tahoe hotel. Roethlisberger denies that allegation and has sued for counter-damages.
Roethlisberger hasn't been charged in either case.
The Associated Press contributed to this report.