She also talked about when her son, Tywanza Sanders, asked Roof why he was shooting them, to which Roof allegedly replied, "I have to do this".
Sitting in an eerily silent courtroom, jurors have seen stark 360-degree computer views of the crime scene in the fellowship hall at Emanuel African Methodist Episcopal Church in Charleston where nine black parishioners were gunned down.
"Seventy-seven shots in that room from someone we thought was looking for the Lord", Sanders testified.
The killer's defence team are instead fighting the death penalty sentence which the prosecution are pushing for.
The former police officer also faces a trial in federal court for violating Scott's civil rights. "The defense has said repeatedly in federal and state court that Roof would be willing to plead guilty if capital punishment was taken off the table".
The victims of a 2015 mass shooting at a historic SC church had their eyes closed in prayer when they were shot, jurors learned Wednesday during an emotionally charged first day of testimony in the federal murder trial of Dylann Roof.
Brittany Burke, then an agent with the SC law enforcement division (Sled) and the lead crime scene investigator on 17 June 2015, described the scene as "very hectic" with bullet cartridges and magazine casings "sprayed throughout the room".
Dylann Roof's mother collapsed on the floor, saying "I'm sorry" several times Wednesday after prosecutors detailed her son's massacre of nine black churchgoers in Charleston, South Carolina, in June 2015.
Local WWII veterans remember attack on Pearl Harbor
They fought the first battle and set the first example in a long campaign of America's enlightened leadership of the free world. It was originally donated by a local World War II veteran in 1975. "I just hope that they understand what it's all about".
The only one of the nine victims not shown in the images was the Rev. Daniel Simmons Sr., who authorities had rushed to a hospital in a vain attempt to save his life.
"I watched my son come into this world and I watched my son leave this world", she said during her heartbreaking testimony, before becoming so overwhelmed with grief that presiding Judge Richard Gergel called a recess.
The emotional case surrounding the shooting deaths of nine parishioners at the historic Emanuel AME Church has shaken SC.
Earlier the judge rejected a defense motion for a mistrial based on a survivor's testimony that Roof was evil and belonged in "the pit of hell".
Defense attorney David Bruck basically conceded his client's guilt during his Wednesday opening statement and asked no questions of Sanders once her testimony was done. Roof faces murder charges in state court, where prosecutors also are seeking the death penalty.
Roof sent a handwritten note to the judge requesting that he be allowed to represent himself during the "sentencing phase".
The descriptions provided by Sanders amount to a survivor inappropriately weighing in on the death penalty, his attorneys wrote in their motion for mistrial filed Thursday morning.