Juan A. Rivera Jr. (born October 31, 1972) is an American man who was wrongfully convicted three times for the 1992 rape and murder of 11-year-old Holly Staker in Waukegan, Illinois. He was convicted twice on the basis of a confession that he said was coerced. No physical evidence linked him to the crime scene. In 2015 he received a $20 million settlement from Lake County, Illinois for wrongful conviction, formerly the largest settlement of its kind in United States history.

DNA testing done in 2004 on semen taken from the crime scene ruled out Rivera as the source. However, the prosecution argued that Staker had been sexually active and the semen sample came from her previous consensual sex with another man. Rivera was convicted a third time. His conviction was overturned by the appellate court. Because the court ruled that there had been insufficient evidence adduced at trial to sustain a conviction, the Double Jeopardy Clause barred prosecutors from retrying Rivera. He was released from prison after serving 20 years.

After his release, Rivera's attorneys asked the courts to order genetic testing on Rivera's shoes. The prosecution had tried to enter these into evidence in 1993. The shoes had Staker's blood on them, but the prosecution withdrew the evidence prior to Rivera's first trial when they learned that the shoes had not been available for sale anywhere in the United States until after the murder.

DNA testing conducted on the shoes in 2014 indicated that the blood belonged to Staker, but it also contained another genetic sample. The DNA in this matched the semen sample from Staker. Rivera's defense team insists that this is proof not only that the blood was planted, but that the real killer's DNA was inadvertently planted as well. The DNA has yet to be matched to an individual, but it has been linked to DNA from the scene of a home invasion and murder in 2000 in Chicago by three men. Only one man of the three has been identified; he was convicted of that crime and is in prison. He claims to have been wrongfully convicted.

Following his exoneration, Rivera sued the city of Waukegan and Lake County; he was awarded $20 million, at its time, the largest wrongful conviction settlement in United States history. This amount included $2 million from John E. Reid & Associates. Rivera was given two polygraph examinations by a Reid employee. He was reported as exhibiting general deception during the examination and subsequently admitted that he did lie to the test question about his alibi, but continued to deny any involvement in the death of Holly Staker. Over the next several days, he was interrogated by law enforcement.

Murder of Holly Staker On August 17, 1992, police received a call from a woman in Waukegan, Illinois, who reported that the babysitter for her two children, 11-year-old Holly Staker, was missing and the back door to the apartment had been kicked in. Staker's partially clothed body was found on the floor of the children's bedroom. She had been raped, stabbed 27 times, and strangled. Vaginal and anal swabs tested positive for semen.

Evidence technicians took fingerprints and blood samples found in the bedroom and near the kitchen sink, where it appeared someone had washed blood off their hands.

Investigation On September 29, 1992, police received a tip from a prison inmate that another inmate, Puerto Rican–born Juan Rivera, believed he knew who killed Staker. According to the informant, Rivera told him he was at a party that night near the crime scene and saw a man acting suspiciously.

Rivera was described by the police as friendly and cooperative when he was interviewed and agreed to provide samples of his blood and hair. He told police he was at a party near the crime scene, when another man, whom he identified as Robert Hurley, left the party more than once before later returning sweaty, out of breath, and with a fresh scratch. Further investigation revealed there was no party at the residence on August 17, leading to greater suspicion of Rivera.

Rivera was questioned for many hours over the course of several days and eventually admitted to killing Staker. Following the confession, jail personnel saw Rivera, who had a history of mental illness, beating his head against the wall of his cell. A prison nurse determined that Rivera was in an acute psychotic state and was "not in touch with the reality of what was going on around him". Several hours later, detectives entered the room Rivera was in and had him sign the summary account taken by detectives. Detectives reviewed the statement and agreed that many details given by Rivera were inconsistent with the known facts of the crime; it was decided that two other members of the Task Force would re-interview Rivera to try to clear up these "inconsistencies".

Rivera's mental state had not improved by the time the next interview was to take place, so he was placed in heavy restraints and a prison psychiatrist prescribed Haldol, Cogentin, and Ativan. Rivera signed a rights waiver and the interrogation resumed. A detective told Rivera that "there were a lot of questions concerning facts" in his previous statement and that "he wanted to give Mr. Rivera an opportunity to tell the truth on some of those issues". During this interview, detectives suggested details such as, "She had a multi-colored shirt on, right, Juan?" He had previously misidentified her clothing. The confession that was eventually settled on was closer to the known facts about the crime, but still contained a number of inconsistencies with the crime scene.

No physical evidence was found linking him to the crime, and the fingerprints taken from the crime scene did not match Rivera. At the time of the crime, Rivera was wearing an electronic monitor from a previous conviction. Electronic monitoring system records showed that Rivera did not leave his home on August 17, 1992. Phone records also showed a call from Rivera's home to a relative in Puerto Rico that evening.

Trials Rivera was charged with first-degree murder on the basis of his confession. He was convicted in November 1993. In 1996, an appeals court reversed the verdict because of several errors, such as the judge allowing hearsay evidence and limiting the defense's opening statement.

Rivera's second trial took place in 1998. Taylor Arena, the child whom Staker had been babysitting, testified at this trial. Arena, who was 2 years old at the time of Staker's murder and 8 at the time of the retrial, testified that she remembered the events of the evening and identified Rivera as the man who had attacked Staker. After four days of deliberation, the jury acquitted him of the first-degree murder charge, but convicted him on three other murder counts. He was sentenced to life imprisonment without parole. In 2001, his conviction was upheld by an appeals court.

DNA testing In 2004, Rivera filed a motion to test the DNA from the vaginal swabs taken from the crime scene. The motion was granted and DNA testing excluded Rivera as the source of the semen sample. In 2006, Rivera's conviction was vacated a second time.

Despite the DNA evidence, prosecutors made the controversial decision to retry the case. They argued that Staker may have been sexually active or that lab technicians mishandled the DNA. Defense experts noted that if Staker had intercourse prior to the fatal attack, semen would have been found on her underwear. Tests on her undergarments were negative for sperm. Her twin sister denied that Holly was sexually active.

On April 13, 2009, Rivera's third jury trial began. On May 8, the jury found Rivera guilty and he was sentenced to life in prison for the third time.

Conviction overturned In December 2011, Rivera's conviction was overturned a third and final time. Rivera was released from prison on January 6, 2012 after Lake County state's attorney Michael Waller announced he wouldn't attempt to appeal the ruling. The appellate court criticized the confession, noting the complete absence of any information that was not previously known to members of the investigation team. Each time Rivera gave information that was not already known, the information proved to be false. For example, Rivera claimed to have burned his clothing in a specific dumpster; there was no evidence of a previous fire in that dumpster. He also told investigators that there was another child at the a when there was only a 2-year-old girl. The only details Rivera was able to give investigators that could be corroborated were details that were already known to them.

The appellate court criticized the prosecution for dismissing the DNA evidence. The prosecution presented two possible theories as to how the DNA could eliminate Rivera: contamination and previous sex with another man. Regarding the contamination theory, where the prosecution speculated that no sperm was recovered from the autopsy, but someone else's sperm came in contact with the swab sometime later, the courts dismissed it as "highly improbable".

The courts similarly dismissed the theory that the victim was sexually active. The evidence presented by the prosecution to support Staker's being sexually active was evidence concerning an incident when she was molested at the age of 8 and an incident of masturbation, and extensive testimony about a pair of red lace panties that she owned. The defense argued that this evidence should never have been introduced because it violated the rape shield law. Typically, this law is invoked by prosecutors to limit the argument by the defense that the victim is the "type of person" who is more likely to engage in sexual activity; however, the law also bars prosecutors from presenting the same type of evidence.

Regarding the State's theories on why the DNA did not match, the court wrote:

The State's theories distort to an absurd degree the real and undisputed testimony that the sperm was deposited shortly before the victim died. Simply put, the State's rationalizations of how the DNA from "Unidentified Male #1" came to be found in the victim's body and why none of the defendant's DNA appeared in or around the victim or anywhere at the crime scene cannot save a conviction obtained on a theory of a violent sexual assault and murder. The State did not present any evidence that the victim was in a relationship with anyone. The most reasonable explanation, therefore, of who murdered the victim is not the defendant but rather someone who, unfortunately, has not yet been identified.

The trial judge was also criticized for precluding the defense from presenting multiple pieces of exculpatory evidence, including testimony from experts regarding false confessions. Several risk factors were present in this case, including a history of mental illness, his mental state during the interrogation, and multiple interrogation techniques that are known to increase the likelihood of a false confession. The jury was also led to believe that Rivera failed a polygraph test. The defense was precluded from telling the jury the actual results, which were inconclusive.

Following the reversal, the appellate court took the extraordinary step of barring prosecutors from retrying the defendant.

Knife In 2014, former Waukegan police chief Dan Greathouse, who is handling the re-investigation of the Staker case, told Rivera's attorneys that a knife had been found a decade before near the crime scene. In 1994, a neighbor uprooted a bush between his house and the murder scene and found a serrated knife. Rivera's attorneys were not notified about the existence of the weapon, and the police destroyed it without any testing. In the original investigation, police found a broken, straight-edged knife in a nearby yard. No physical evidence connected that weapon to the crime, but prosecutors argued that it was the murder weapon. Rivera confessed that he had broken the knife during the crime and then discarded it.