Edgar Ray Killen will be sentenced Thursday for his role in the 1964 deaths of James Chaney, Michael Schwerner and Andrew Goodman. He could get a maximum of 20 years in prison on each count.
Some are asking whether more people should be charged in the case.
Killen is the man believed to have organized and orchestrated the deaths of the three civil rights workers, but there are six other people still alive who prosecutors say they believe were involved.
Those six were tried during the federal conspiracy trial in this case in 1967. There is a call from some inside and outside of Philadelphia to move toward trying others.
"Others responsible for the crime must be brought to justice as well. You never know what's going to happen tomorrow, but right now we've done all we can do," said Neshoba County District Attorney Mark Duncan.
Attorney General Jim Hood says several of the others were offered immunity to testify against Killen, but refused. He also says he believes some of them have convinced themselves over the last 40 years that they were not involved.