An employer’s welfare report started the investigation that located Tracy Nyariki’s remains at a Maryland hotel and identified her killer.
NEWARK, Del. — Tracy Nyariki’s employer contacted police after she failed to appear for work for several days, setting off a late-night welfare investigation that soon crossed state lines and uncovered her killing.
The call brought New Castle County police to the Village of Kent Apartments on Dec. 20, 2024. Officers arrived in the 2700 block of Stone Place at about 10:12 p.m., according to the department’s initial public account. Nyariki was not inside her home, but investigators found circumstances they considered suspicious. What began as an effort to locate a missing employee became a homicide investigation that led detectives to a hotel in Aberdeen, Maryland, where Nyariki’s remains were found in the trunk of a car belonging to her former boyfriend, Nobert Matara.
The sequence offers a different starting point from the later court case. Police were not summoned by a reported attack, a witness or a discovery of remains. They were called because a worker who was expected to appear had stopped arriving. Officials have not identified the employer or said exactly how many scheduled shifts Nyariki missed. The employer’s concern nevertheless gave officers a reason to check her home and established the last known interruption in a routine built around her nursing work.
Once inside the apartment investigation, officers had to determine whether Nyariki had left voluntarily, suffered an emergency or become the victim of a crime. Police said the scene contained suspicious circumstances, but their initial release did not describe them. The department’s decision to withhold those details protected the active investigation and prevented public disclosure of evidence that could later be tested in court. Detectives from the New Castle County Police Department assumed control of the case and began looking beyond the apartment complex.
The search led approximately 35 miles southwest to Aberdeen. Authorities found Matara at a hotel there, along with Nyariki’s remains in his vehicle, according to Delaware prosecutors. Maryland officers took Matara into custody before he was returned to Delaware to face prosecution. The discovery answered the urgent question of where Nyariki was, but it transformed the investigation into one requiring work at several scenes: her apartment, the vehicle, the hotel and any route used to travel between Delaware and Maryland.
Prosecutors later supplied the chronology that officers did not have when they first responded. They said Matara had gone to Nyariki’s residence on Dec. 17 and waited inside for hours. After Nyariki returned, Matara attacked her. The state said she was stabbed 58 times, after which Matara dismembered her body and placed her remains into a suitcase. He then left Delaware and drove to Maryland. Officials have not released a full account explaining his movements during the three days between the killing and his arrest.
Nor have authorities publicly identified the evidence that allowed investigators to connect the apartment to Matara so quickly. Public reports do not say whether detectives relied on phone records, vehicle information, surveillance footage, interviews, physical evidence or a combination of those sources. The guilty plea ultimately removed the need for prosecutors to introduce that evidence at a jury trial. As a result, many of the investigative steps that connected the welfare call to the Aberdeen hotel remain outside the public record.
The police department announced the homicide investigation Dec. 23, three days after officers were dispatched to Stone Place. Early news coverage showed investigators continuing to process Nyariki’s first-floor apartment while residents of the complex tried to understand the police presence. At that stage, the public knew that Nyariki had been reported missing, that remains had been recovered in Maryland and that a man was in custody. The more detailed account of waiting inside the home and carrying away her remains emerged later from prosecutors.
The case moved from investigation to prosecution over the following 16 months. Matara, identified by the Delaware Department of Justice as a Newark resident, was charged with first-degree murder. On April 29, 2026, he appeared in New Castle County Superior Court and pleaded guilty. The plea constituted an admission to the murder charge and eliminated the need for a trial. The state said Matara faced a mandatory sentence of life in prison, making the ultimate punishment clear when his plea was announced.
On June 26, Matara returned to Superior Court and received that life sentence. The Department of Justice announced the result six days later. Attorney General Kathy Jennings credited New Castle County police and the state’s trial team with bringing the prosecution to its conclusion. She said the facts were difficult to comprehend and expressed sympathy for Nyariki’s relatives. Her statements marked the transition from an active criminal case to a completed conviction and sentence.
The employer whose call initiated the case has not been publicly named, and officials have not said whether the workplace participated in later proceedings. Even without that information, the timing is important. Nyariki was killed Dec. 17. Officers were sent to her apartment late Dec. 20. Matara was then found at the Maryland hotel with her remains. The employer’s decision to report the absence kept the period between the killing and police intervention to a matter of days rather than allowing the disappearance to continue without official attention.
Nyariki’s profession also gives the missed shifts greater meaning. Memorial accounts described her as a nurse who had moved from Nairobi, Kenya, to the United States to pursue that career. Her absence would have been noticed in a workplace organized around scheduled care and responsibility to patients. An obituary said Nyariki was known for generosity and compassion and had made a lasting impression on patients and colleagues. Those descriptions have not been part of the criminal proof, but they explain why her unexplained silence alarmed people who expected her presence.
Public sources differ on Nyariki’s age. Police and early news reports identified her as 31, while the Delaware Department of Justice later said she was 33. No official explanation for the discrepancy has been released. The difference illustrates the importance of separating details established at the beginning of a fast-moving investigation from information presented later in a prosecution. It does not affect the state’s account of the killing, the recovery of her remains or Matara’s admission of first-degree murder.
The state has not publicly offered a motive. Officials identified Matara as Nyariki’s former boyfriend, but they have not said why he was at her apartment or whether she knew he planned to be there. No verified public account establishes what was said between them when she arrived home. Prosecutors did not need to present a motive at trial because Matara pleaded guilty. The lack of a public explanation leaves investigators’ factual chronology intact while limiting conclusions about why the crime occurred.
Because the case ended in a plea, the public record is narrower than it might have been after a trial. Jurors did not hear a day-by-day reconstruction. Detectives did not testify in open court about the evidence at Stone Place or the trail to Maryland. Medical experts did not have to explain their findings. The essential facts instead appear in police releases, the attorney general’s announcements and Matara’s guilty plea. That record is enough to establish responsibility but not to answer every question about the investigation.
The central thread remains the report from Nyariki’s workplace. A missed shift became several unexplained absences. Those absences brought officers to a home where they found reason for concern. Their investigation then located Matara and recovered Nyariki’s remains. More than a year later, the same chain of events ended with a guilty plea and mandatory life sentence. The person who first called police could not change what had already happened, but the call ensured that Nyariki’s disappearance was recognized, investigated and brought into the justice system.
Matara is now serving a life term for first-degree murder. Delaware officials have announced no further criminal proceedings in the case, and the Superior Court sentence resolved the charge arising from Nyariki’s death. Police have not issued a complete public investigative report. For the co-workers who noticed she was gone, the final judgment confirms the reason she never returned while preserving the record of the concern that prompted authorities to look for her.
Author note: Last updated July 31, 2026.