UPDATE 12:05 p.m.: Roof spoke to the jury for the first time in the sentencing phase.
Roof said his lawyers "forced" him to go to competency hearings.
Meanwhile, prosecutors urged that Roof be sentenced to death, citing his lack of remorse. He said in his journal he had not wept over the victims' deaths and regretted nothing.
Jennifer Pinckney, the widow of one of Roof's victims, Clementa Pinckney, said her husband was a "voice for the voiceless." She is one of several dozen witnesses the prosecution has planned to call.
At this point I'm not intending to offer any evidence at all or call any witnesses.
ORIGINAL STORY: Dylann Roof is expected to offer an opening statement but no defense as his sentencing resumes Wednesday.
Roof was convicted of killing nine people in a historically black Charleston church in June 2015. He faces either the death penalty or life in prison. His lawyers urged him not to represent himself, but he did so anyway.
Roof's lawyers initially tried to argue that the self-described white supremacist was mentally incompetent to stand trial, but Roof insisted on representing himself. U.S. District Court Judge Richard Gergel ruled in Roof's favor, USA Today reports.
What happens next?
It took the same jury Roof now faces for the sentencing phase less than two hours to find him guilty of all 33 federal counts against him, including hate crimes.
Prosecutors said they may call as many as three dozen witnesses to argue Roof should get the death penalty, despite some victims' family members saying they would prefer he gets life in prison. Meanwhile, Roof's lawyers fear he won't show evidence that could spare his life out of fear of embarrassing himself or his family.
WATCH | During the trial, a video of Roof taking target practice before the slaughter in the Charleston church basement was admitted in court as evidence.
The Associated Press contributed to this report.