More shocking details surrounding the death of Bobbi Kristina Brown has surfaced and a private investigator speaks out about possible physical evidence that has surfaced.

WATCH: Bobby Brown Says Bobbi Kristina’s Death ‘Wouldn’t Have Went Down’ If He Was There

Police are still trying to figure out how Bobbi Kristina, the only child of the late Whitney Houston and singer Bobby Brown, was found unconscious and unresponsive in her bathtub back on Jan. 31. Following a series of treatments, she died on July 31.

While authorities are investigating as a criminal case, her family is convinced that her longtime boyfriend Nick Gordon is the one behind it all. They hit him with a $40 million lawsuit that claims he gave her a “toxic cocktail” and physically beat her.

Bobbi Kristina Brown’s Grandmother ‘Collapsed In Grief’ After Nick Gordon Went To Visit Her Gravesite

Well he clapped back and revealed in response to the lawsuit that the night before she died, “he reviewed video footage and then had an argument with Ms. Brown, and he then changed clothes.”

The question now lies as to what video he viewed, and why he thought it was necessary to not only change his clothes but point out that he did so. Even though it could have been an attempt to be completely transparent and cooperate with authorities and prove his innocence.

But a private investor and ex NYPD homicide detective Bo Dietl said Wednesday, “That’s very strange — the part about changing clothes. Obviously [the reason] could have been the blood splatter on his clothes whens he got her tooth knocked out— that could be a reason to change your clothes.”

As far as the video footage goes, he added, “If they had cameras going, they may have actually captured video of him assaulting her!”