Bobbi Kristina Brown's 'husband' moved out of their home days before she was found unresponsive in a bathtub.

The 21-year-old aspiring actress - the daughter of the late Whitney Houston and singer Bobby Brown - is currently fighting for her life in hospital after being admitted on January 31, and insiders say she had been feeling distraught following an explosive row with Nick Gordon on January 23 which led to him leaving their house in Atlanta.

A source said: ''She was depressed and very upset.''

And Bobbi - whose father recently denied that she and Nick ever married - was said to be struggling with the upcoming three-year anniversary of her mother's death.

The source added to Us Weekly magazine: ''Whitney's death hit her harder than anyone will ever know.''

Meanwhile, it has been claimed that police are investigating the possibility another person was in the house before Nick and a friend discovered Bobbi in the bath.

Police - who attended the property following an emergency call placed at 10.25am - have been asking store owners in the Ellard Village strip mall adjacent to the gated community if they saw any suspicious persons or movements prior to them arriving on the scene and visited the Sun Trust Bank, which is less than 100 yards away from the couple's home, to ask for parking lot surveillance video.

The source told E! Online: ''[Police] were asking if they saw anyone jump the wall behind the house, or if anyone was seen leaving the area.

''But no one recalled seeing anyone or anything suspicious. But the cops also were looking for video.''