Nick Gordon admits in a videotaped interview that he violently argued with girlfriend Bobbi Kristina Brown just before she had to be a rushed to a hospital emergency room where she never regained consciousness.

Radar Online reports the 25-year-old Gordon also admits to mysteriously changing clothes sometime around the same time Whitney Houston and Bobby Brown's 22-year-old daughter was found face down in a bathtub of water at the Atlanta area home the two shared in late January.

Gordon made the admissions in a legal response to the $40 million wrongful death suit he now faces in connection with his girlfriend's death. Bobbi Kristina died in late July under hospice care and has since been buried next to her mom at a New Jersey cemetery.

Reports are in new fillings made formal in Georgia Superior Court of Fulton County on Sept. 8, Gordon deems accusations of killing his girlfriend as "frivolous" and "untrue" rumors that he beat her and gave her a "toxic cocktail" that rendered her defenseless in the hours before she was hospitalized.

Meanwhile, world-renowned private investigator and former NYPD homicide detective Bo Dietl told Radar he is shocked and amazed attorneys for Gordon allowed him to acknowledge the unexplained wardrobe change.

"That sounds very strange," he said. "Obviously, [the reason] could have been the blood splatter on his clothes when she got her tooth knocked out."

Dietl later added, "If they had these cameras going, they may have actually captured video of him assaulting her."

Gordon is the last known person to have seen his girlfriend alive and friends of his have told Radar they believe he was responsible for her death because she was about to leave him and pursue a music career in California.

Though he was banned from visiting her while she was hospitalized by her family, Gordon recently made a trip to Bobbi Kristina's gravesite, where he was captured in photos the New York Post now reports he was paid up to $40,000 for by another publication.