Calleigh testifies in court about why she believed Reyes comitted murder. Calleigh says DNA evidence appeared on the murder weapon. The defense attorney Derek Powell (played by Sean 'P. Diddy' Combs) asks Calleigh if it is possible that Reyes's DNA surfaced when he tried to help the victim. Calleigh says it is possible. The prosecutor then calls the medical examiner who describes how Lindsay was killed. Horatio waits outside with Lindsay's father who is unable to hear the details of his daughter's murder. The trial proceeds and although Mr. Reyes had argued with Lindsay, there is some doubt that he is the killer. The jury deliberates, then returns with a guilty verdict against Alfonso Reyes.

Horatio goes to Lindsay's body. A fly appears when her body bag is unzipped. Horatio is surprised. He then looks closer and sees that Lindsay is covered with flies. He says it changes everything. Calleigh tells Ryan and Eric that they are reopening Lindsay's case. Calleigh instructs Ryan and Eric to go back to the country club to investigate while she goes over the evidence box. She says Reyes could be innocent.

Ryan and Eric go to the country club and look at the locker room. They see that it is immaculate and think they won't find any new evidence. Eric says they are back at square one.

Horatio meets with Powell and says he may be able to exonerate Reyes. Powell says he was planning on filing an appeal once he had his evidence gathered. Powell says he has a new witness named Tammy Witten who claims to have seen the victim dead outside of the country club. Horatio instructs his team to find Tammy.

Tammy is in the hospital suffering from a drug overdose. The doctors are able to stabilize her and Boa Vista and Frank meet with her. Tammy tells them she went to rehab and was doing well, but had a relapse. Boa Vista asks if she overdosed on purpose. Tammy says she couldn't live with herself. Tammy says she saw Lindsay the day she was killed. She says it was near a restaurant on Third. Tammy says a car tore out in front of her and nearly hit her. Tammy says she saw Lindsay dead in the front seat. She says she saw Lindsay's picture in the paper the next day, but didn't say anything. Tammy says she finally told Powell, but he didn't believe her. Tammy thinks she was too late. Boa Vista tells Tammy it's never too late.

Boa Vista and Ryan go to the scene and see evidence that Lindsay's car hit the wall. Boa Vista hears a buzzing and Ryan notices a camera. Boa Vista says it is a dummy camera. They investigate the strange noise further. Boa Vista picks up a bag of trash and unveils a huge mass of maggots and flies. Boa Vista takes a sample and sees it is the same fly found in Lindsay's body. Boa Vista says the fly proves Lindsay was strangled in the alley.

Eric dusts Linday's car for prints while Calleigh takes pictures. Calleigh then gets a call from Ryan who says they didn't find anything other than the fly. Eric says he didn't find any prints. Calleigh notices blood on the seat. Eric says it is a weird pattern.

Horatio meets with Reyes and asks him to talk about Lindsay. He says he was teaching golf and he caught her sneaking on the grounds. He says he let her come back because she was pretty, but eventually realized she was just using him to gain access to rich men. Reyes says they argued after she was dumped by some guy and came back to the club. She asked him to let her sneak in again, but he didn't want to risk losing his job. He says he found her body two hours later. He says her body fell out of his locker and he tried to revive her. Reyes tells Horatio the ex-boyfriend's name was Andy Durbin.