Sammy Tawil, who has known the Houston family for over 25 years, shares private photos with RadarOnline.com of the late Bobbi Kristina Brown.
"I never saw her do drugs, maybe she knew better not to in front of me," Tawil tells RadarOnline.com of Brown, here with her self-professed "husband," Nick Gordon.
"I tried to bring normalcy to her," says Tawil.
Tawil often spent time with Brown, including over the Fourth of July. "When she was with Nick, she couldn't see past him," notes Tawil. "That was the only way she was vulnerable.
Tawil isn't convinced that Gordon was involved in Brown's death, despite family speculation to the contrary. "I'm 99 percent convinced he didn't intentionally hurt her," he insists. "I don't think Nick would ever kill Krissi. I'd be shocked. If any evidence came out that he touched her, I'd be shocked and devastated."