Jennifer Lee Daugherty (November 8, 1979 – February 11, 2010) was an American woman from Mount Pleasant, Pennsylvania, who was killed by a group of people later referred to as The Greensburg Six, in an act of revenge, in February 2010. Daugherty, who was mentally disabled, was humiliated, tortured, sexually assaulted and murdered by a group of individuals she considered to be her new circle of friends. Her body was wrapped in Christmas decorations, placed inside a trash can and discarded in the parking lot of Greensburg-Salem Middle School.

Trials for all six perpetrators lasted over 12 years, spanning between 2010 and 2022, resulting in sentences varying between the death penalty and 20-80 years in prison.

The case garnered national attention for its brutality and led to proposed legislative changes, such as “Jennifer’s Law,” which would criminalize failing to report violent crimes witnessed in the state of Pennsylvania. The initiative was signed into law in 2012.

Amber Meidinger met Melvin Knight at a homeless shelter in Washington in January 2010. They moved to several locations before settling in Greensburg, Pennsylvania, where they met Jennifer Daugherty. Knight met Ricky Smyrnes after meeting previously in jail.

Knight and accomplice Angela Marinucci both were alleged to have suffered from severe mental impairment at the time of the murder. Knight was born to a drug-addicted father who was imprisoned during the early years of his life. He developed lifelong learning and social disabilities after he fell out of a moving vehicle and hit his head at age 5. According to testimony by Marinucci's mother and half-sister, she suffered a head injury when she was hit by a truck in 2008, at the age of 15. The injury substantially altered her behavior and pushed her into a downward spiral that ended with Daugherty's death, according to the defense. Two mental experts testified that Marinucci suffered from depression as a child and might have had drug and alcohol addictions as a teenager.

Peggy Miller and Robert Masters were roommates of Ricky Smyrnes and had minimal contact with law enforcement prior to the murder. Smyrnes was born to a drug-addicted Philadelphia sex worker and a Pittsburgh gang member. He was moved into and out of foster homes as a child and was treated for mental health disorders as early as age 4. He suffered abuse and neglect until he was taken in by the Smyrnes family in North Huntingdon at age 10, according to testimony by forensic psychologist Alice Applegate. His lawyer, Terri Fayes, told the jury that Smyrnes suffered sexual and physical abuse from his father and his uncle. She also explained how he had tried beer, cocaine, heroin, and marijuana by age 6, had been diagnosed with PTSD at age 8, and had undergone 103 therapy sessions by age 10. She added he was diagnosed as having as many as seven different personalities, and 15 total psychiatric issues. In 1997, he burglarized his neighbor's home and stole knives, guitars, coins, bullets, and cash. That same year, he sexually assaulted a woman in her basement.

Meidinger testified she and Knight, her then-boyfriend, met Smyrnes on February 8, 2010, after the couple had been staying at a Greensburg-area hotel. Smyrnes invited Meidinger and Knight to stay at his apartment at 428 N. Pennsylvania Avenue in Greensburg, where the murder would occur three days later.

Daugherty's last recorded words were a note to her mother that said, “Mom, I hope you have a good day at work, and I love you very much. Love, Jennifer”.