The women had argued online but had never met in person before the fatal encounter, prosecutors said.
BOSTON, Mass. — On a July night near Boston Common, a 21-year-old mother walking toward Park Street station ran into a woman prosecutors said had been threatening her online. Nearly three years later, that encounter ended in court with a manslaughter plea and a 15- to 20-year prison sentence.
The case matters because prosecutors described it as a fatal collision between online hostility and real-world violence in one of Boston’s busiest public spaces. Alyssa Partsch, 33, admitted guilt on April 1 in Suffolk Superior Court, avoiding a trial that had been expected later in the month. The victim, Jazreanna Sheppard of South Boston, was remembered in court as a loved family member and mother whose death still shapes the people around her.
The known timeline begins late on Thursday, July 20, 2023. According to prosecutors, Sheppard was in Boston Common with a friend near Brewer Fountain at about 11:30 p.m. They were leaving the park and heading toward the Park Street MBTA pavilion when they encountered Partsch. The women had not met in person before that night, prosecutors said, even though they had already been feuding online. What happened next unfolded quickly. Surveillance video, according to the district attorney’s office, showed the two women in a physical altercation after Partsch approached with a knife. Prosecutors said Sheppard was stabbed several times in the face, head and torso. Boston police officers were sent to the area of 121 Tremont St. at about 11:34 p.m. for a report of a stabbing and found an adult woman suffering from serious wounds. Sheppard was taken to the hospital, where she later died.
The second part of the story sits in the records that came before the attack. Prosecutors said witness testimony and documentary evidence showed a series of social media exchanges in which Partsch threatened Sheppard and tried to entice her into a fight. Officials have not publicly released those exchanges in full, and that leaves some details unknown, including how long the feud lasted and whether others tried to step in before the women crossed paths downtown. What has been made public is the prosecution’s basic theory: the online dispute was not background noise but the setup for the confrontation. That made the first face-to-face meeting central to the case. Authorities later said Partsch fled through the MBTA system after the stabbing, a detail that tied the attack to the transit station itself and helped shape the case investigators later built from video footage and witness accounts.
For months after the killing, the public record remained thin. Police announced the original stabbing response and later identified the victim as Sheppard, 21, of South Boston. An arrest came on Nov. 4, 2023, when members of the Fugitive Unit took Partsch into custody in Dorchester at about 6 a.m. on a murder warrant. She was 30 at the time of that arrest, according to Boston police. The delay between the killing and the arrest meant that the case developed in two stages: first as an unsolved homicide near a major subway stop, then as a prosecution that turned on digital exchanges, witness accounts and surveillance footage. Boston’s Park Street area, crowded by commuters, office workers, visitors and people crossing the Common, became the backdrop for a case that carried both the randomness of public violence and the pointed history of a personal feud.
By the spring of 2026, the legal posture had narrowed. Partsch had originally been charged with second-degree murder, but on April 1 she pleaded guilty to manslaughter. Judge Mary Ames sentenced her to 15 to 20 years in state prison. A jury trial had been scheduled to begin later that month, so the plea changed what the public would see: instead of a trial with witnesses and contested evidence, the case ended in a hearing dominated by formal admissions, sentencing arguments and statements from the bench. The court did not publicly resolve every open question, including the full rationale for the plea agreement, but it did settle the immediate criminal case. In remarks delivered directly to Partsch, Ames called the killing senseless and spoke about the consequences for Sheppard’s family, especially the young child who would grow up without his mother.
The hearing closed with voices that shifted the story away from procedure and back to loss. Sheppard’s relatives described her as a deeply loved human being and said her care touched many people around her. Suffolk County District Attorney Kevin Hayden said she had been remembered as a compassionate daughter, sister, cousin and mother. Those characterizations did more than humanize the victim; they marked the distance between the place where the case started and where it ended. It started in the movement of a summer night near the Common and the station entrance. It ended in a courtroom where no one disputed that Sheppard was dead, that Partsch had admitted criminal responsibility and that the remaining work belonged to a family now charged with keeping memory alive where a future had been cut short.
With the plea entered and sentence imposed, the case’s central unanswered issue is no longer who was responsible but what additional court action, if any, may follow in post-conviction proceedings after a fatal meeting that prosecutors said grew out of threats sent online.
Author note: Last updated April 23, 2026.