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CHARLESTON, SC - JULY 16: Dylann Roof (R), 21, listens to proceeding with assistant defense attorney William Maguire during a hearing at the Judicial Center July 16, 2015 in Charleston, South Carolina. Roof is charged with murdering nine worshippers at a historic black church in Charleston last month. (Photo by Randall Hill - Pool/Getty Images)
CHARLESTON, SC - JULY 16: Dylann Roof (R), 21, listens to proceeding with assistant defense attorney William Maguire during a hearing at the Judicial Center July 16, 2015 in Charleston, South Carolina. Roof is charged with murdering nine worshippers at a historic black church in Charleston last month. (Photo by Randall Hill - Pool/Getty Images)

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Dylann Roof: 'I do not regret what I did'

As sentencing begins in the Charleston church shooting trial, prosecutors reveal chilling writings from Dylann Roof. CNN's Martin Savidge reports.

Dylann Roof: 'I do not regret what I did'

As sentencing begins in the Charleston church shooting trial, prosecutors reveal chilling writings from Dylann Roof. CNN's Martin Savidge reports.