Bobby Brown's turmoil was evident as he took to the stage for a performance in Atlanta on Saturday.
The 46-year-old, whose daughter Bobbi Kristina Brown was transferred to a hospice on June 24 after her condition deteriorated, was fulfilling a professional commitment as he appeared at the Affordable Old School Concert Series, a Fourth of July celebration at Wolf Creek.
The singer struggled to get through his set, and apologized repeatedly to the audience for forgetting lyrics and dance moves, TMZ reported.
The website sated: "There's no doubt his focus could not have been on stage."
While he didn't make direct reference to the latesttragedy to strike his family, the toll of the last few months was apparent.
In video taken at the gig by a fan, the singer can be heard telling the crowd: "I'm in a different zone."
The footage emerged just days after it was reported that an extended member of the family had attempted to sell an image of Bobbi Kristina Brown to the press, as she lies in a coma.
On Friday (3 July) Bobbi Kristina's paternal aunt, Leolah Brown, took to Facebook to express her outrage that a family member would attempt to make money out of her niece's tragic circumstance.
She wrote: "I'll tell you what! You took that picture thinking you gon get some money for it...and that's gon be it! ...guess what!????!!!! I will myself if no one else does-see to it that -YOU be revealed!!!!"
Media gathered outside the hospice have reported that two Georgia state troopers have been positioned outside the hospice doors in a bid to 'beef up' security over fears Bobbi Kristina's death is 'imminent'.
In an interview with Fox News, a source close to the family said: "She barely has any signs of life, hardly any vitals. Even law enforcement have been called because the families have been told that death is now imminent. They want to make sure photographers don't get pictures of her body being removed."
Bobbi Kristina was placed in a medically induced coma five months ago after she was found face down and unresponsive in the bath tub at her Atlanta home which she shared with her partner Nick Gordon.
Nick Gordon is facing a $40million lawsuit in which it is alleged he attacked her on the day she was discovered at the home they shared in Roswell.