The 24-year-old tragically passed away earlier this year. Nearly two months after Toni Braxton’s niece Lauren Braxton passed away suddenly, the medical examiner has concluded their report on her cause of death. According toE! News, the 24-year-old died of a heroin overdose and fentanyl intoxication on April 29. At the time, TMZ reported that a 911 call came in and …