BROOKLYN - The retrial of a teen accused of stabbing her 16-year-old cousin to death in Crown Heights back in 2008 began today.

A judge had declared a mistrial in the Tiana Browne murder case last October because a prosecutor withheld information about a key witness' criminal past.

Victim Shannon Braithwate, 16, was a student at the Vanguard School who loved to dance. Police say they have Browne on tape confessing to stabbing Braithwate 49 times.

At the time of Braithwate's death, her family said they had taken in the then-15-year-old Browne to give her a chance to turn her life around. She'd been with the family two days before the fatal stabbing.

Browne, now 18, is being charged as an adult.

Judge declares mistrial in Tiana Browne murder caseOpening statements begin in Tiana Browne murder trialTeen found brutally stabbed inside her Brooklyn home