The Prosecution

Once an investigation has ended, it is time to take the case to the court, in order to attempt to prosecute the person suspected of the crime, assuming that the defendant pleaded not guilty. In the court their verdict will be decided by the Jury, which needs to be convinced to either find the defendant guilty or not guilty. It is the job of the prosecution to convince the Jury that the defendant is Guilty.
If a defendant pleads not guilty, then no trial will take place, and they will simply be sentenced, usually for a lesser amount of time than had they been found guilty through a trial.

The Prosecution team investigate the case alongside the detectives, in order to analyse the evidence and form the case with the detectives, so that it will be prepared at the time of the court room case. 

Once the trial had begun, the Prosecution will use the evidence gathered by the police to convince the Jury of the defendants guilty through Interviewing specialists, witnesses and the defendant about these items of evidence. 

The OJ Simpson Case

During the OJ Simpson Case, the lead prosecutor was Marcia Clarke, aided by Christoper Darden and Gil Garcetti, whom together formed the Prosecution Team. 

Marcia Clarke and Christopher Darden

Marcia Clarke, who was the Deputy District Attorney for Los Angeles at the time, believed wholeheartedly in the guilt of OJ Simpson, and fought to have the jury find him guilty. The prosecution team presented evidence to the court which proved that OJ Simpson had previously beat Nicole Brown Simpson, proven by the numerous 911 calls she made to the police asking for help reportedly saying "He's going to beat the sh*t out of me" Due to the evidence of his previous abusive behaviour, Marcia Clarke attempted to convince the Jury that it was within his character to commit violent crimes, especially against Nicole. 

The Prosecution also presented evidence that OJ was the killer due to the vast amount of his DNA found at the scene, however this evidence was then seen to be contaminated due to the vast amount of blunders made by the SOCO team. 

There was a glove found at the crime scene which matched one found at OJ's house, a fact which prosecutor Christopher Darden believed would help convince the Jury, especially if the Jury saw OJ wearing the gloves. The prosecution found information proving that Nicole had bought the gloves at Bloomingdale's the previous year, linking the gloves directly to OJ Simpson.

However, when OJ tried on the gloves, they did not fit, seeming too big for him - a fact which placed doubt in the Jury's head. This blunder potentially cost the prosecution the trial.