Death penalty now a possibility in alleged Mississippi hate killing
- Charge against teen suspect Deryl Dedmon upgraded from murder to capital murder
- Justice Department investigating alleged hate crime killing of black man by white teen driver
- James Craig Anderson, 49, was run over and killed on June 26
- Authorities say white teens targeted Anderson because he was black
Editor's note: The following story contains language some readers may consider offensive.
Jackson, Mississippi (CNN) -- The prosecutor investigating the hit-and-run killing of a black man in Jackson, Mississippi, announced he has upgraded the charge against suspect Deryl Dedmon from murder to capital murder. This makes the white 19-year-old suspect eligible for a possible death sentence if convicted.
Hinds County District Attorney Robert Smith released a statement that said the upgrade to capital murder was made after new evidence was discovered that supported the allegation that Dedmon committed the crime of robbery during the commission of the killing of James Craig Anderson.
"It does not change the theory of the case," Shuler Smith told CNN. "It is still a hate crime."
The killing -- which sparked national attention after CNN obtained and aired exclusive surveillance video 
that shows the attack as it took place -- is also being investigated by the U.S. Justice Department, federal and Mississippi officials tell CNN.
Anderson, 49, was first beaten by the group of teens as he stood in a hotel parking lot early on the morning of June 26, according to some of the teens who were interviewed by police.
After the beating, a group of the teens drove a large Ford pickup truck over Anderson, according to witnesses and officials. Anderson died from his injuries later the same day.
Federal investigators are in Jackson at the request of Smith, who says he will be seeking indictments against some or all of the white teens in coming weeks.
"This was a racially motivated murder, committed because the victim was black. We want to prosecute and bring justice in this case to the fullest extent of the law," said Smith, explaining that he called Justice Department officials and asked for more investigators to come to Mississippi to help interview witnesses and pursue leads in the crime.
Under federal law, authorities can pursue further charges and punishment if it is determined that a crime was racially motivated. Officials from the U.S. Department of Justice confirmed to CNN that "the department has an ongoing investigation."
Opinion: Hate crimes are a national problem
The group of teens that night was led by Dedmon of Brandon, Mississippi, according to police and officials in the DA's office. Dedmon is being held in Jackson.
Another teen, John Aaron Rice, was also charged with murder at first, until a judge reduced his charges because Rice was not believed to be driving the vehicle used to kill Anderson.
Smith and officials in the Hinds County District Attorney's office say they plan to indict both Dedmon and Rice for murder and a hate crime.
Attorneys for Dedmon and Rice did not return CNN's calls.
During a bond hearing, Dedmon's attorney told the court he saw nothing to back up the "racial allegations."
Neither teen has pleaded yet, and none of the other teens has been charged.
But Hinds and officials from the DA's office say they hope to bring indictments against not only Dedmon and Rice, but also other teens who were in their cars and part of the attack that early morning.
DA: Video shows white teens driving over, killing black man
Dedmon led and instigated the attack, according to officials; he took part in and led the beating of Anderson, and Dedmon was also the driver of the Ford 250 truck that served as the murder weapon, according to officials.
Before the murder, as the teens were partying and drinking miles away from Jackson that night, in largely white Rankin County, Dedmon told friends they should leave, saying, "Let's go fuck with some niggers," according to law enforcement officials.
Then the gang of teens climbed into Dedmon's green truck and a white SUV Cherokee and drove 16 miles down Interstate 20 to the western edge of Jackson, a predominantly black area.
The teens would have seen Anderson immediately as they exited the highway, because the parking lot where he was standing is just beside the exit ramp.
"This is the first business that you get to coming off the highway and so that was the first person that was out here and vulnerable," said Smith.
On the videotape, obtained and reviewed by CNN, a truck is seen pulling into the parking lot and stopping where Anderson is standing, though he is just off camera and not visible.
Teens can then be seen going back and forth between their cars and Anderson.
Watch the video (contains graphic images; discretion advised)
Witnesses told law enforcement officials this is when the repeated beatings of Anderson took place. Dedmon pummeled Anderson repeatedly as he crumpled to the street, according to officials, though this is not visible in the videotape.
After the beating, some of the teens left and some got into the truck.
At this moment on the video, Anderson becomes visible, as he staggers into view and walks toward the headlights of the truck. The truck suddenly surges ahead, running over Anderson, then continues at high speed away from the scene.
Shortly after he allegedly drove the truck over Anderson, Dedmon allegedly boasted and laughed about the killing, according to the testimony of police detectives who interviewed the teens.
"I ran that nigger over," Dedmon allegedly said in a phone conversation to the teens in the other car. He repeated the racial language in subsequent conversations, according to the law enforcement officials.
"He was not remorseful. He was laughing, laughing about the killing," said district attorney Smith.
