Investigators say video, alarm records and evidence inside the business helped narrow their focus before the suspect’s arrest in Maryland.
SWATARA TOWNSHIP, Pa. — Surveillance footage and electronic alarm records helped investigators reconstruct the minutes before a woman was found dead inside a Dauphin County auto parts business, leading police to a coworker who was arrested hours later in Maryland.
Clifton Emerson Sr., 63, of Harrisburg, faces a first-degree murder charge in the death of Mary Kelly at Factory Motor Parts on Bobali Drive. Swatara Township police said Maryland State Police took Emerson into custody Tuesday evening as township detectives headed south to continue the investigation. Court records describe video, employee accounts and physical evidence that police used to link Emerson to the scene. The charge remains an allegation and has not been proved in court.
Police said surveillance footage showed Kelly arriving at the business at about 7:17 a.m. Tuesday. An alarm log showed the system was disarmed about a minute later using Kelly’s employee code. Investigators said employees had individual codes, allowing police to compare the alarm record with the video timeline.
A red Chevrolet SUV pulled into the parking lot shortly after Kelly arrived, according to the affidavit. A man got out and moved toward the building entrance. Police said the person later disappeared from the camera’s view beneath a covered area leading to the front door. Investigators reported no signs of forced entry and said no other entrances or exits appeared to have been unsecured.
Police said the man was seen returning toward the SUV at about 7:37 a.m. Employees who arrived around that time later told investigators that Emerson drove a vehicle matching the SUV in the recording. Authorities said they checked the vehicle information and connected the SUV to Emerson.
The arriving employees encountered signs that something was wrong inside the building, according to court records. They reported seeing a spilled coffee cup in a hallway, damage to drywall and blood leading toward Kelly’s office. One worker looked through the office window, saw Kelly on the floor and left with a colleague to call for help.
Swatara Township police said officers were dispatched to the business at 7:58 a.m. and determined that a homicide had occurred. Investigators reported finding a trail of bloody footprints extending from the office area into an adjacent warehouse. The trail led toward a trash can where police said two blood-covered kitchen-type knives and material believed to be hair were recovered.
Police said the available surveillance footage showed Kelly and the man associated with the red SUV as the only people at the business during the critical period before other employees arrived. Investigators also interviewed workers about Emerson, including how long he had worked there and recent comments he allegedly made about his work schedule and finances. Police have not said that any single piece of evidence, by itself, established what happened inside the office.
The investigation quickly expanded beyond Pennsylvania. Swatara Township police announced Tuesday night that Maryland State Police had taken Emerson into custody. A family member told CBS 21 that Emerson had gone to a relative’s home in Maryland, where police later arrested him without incident. Police did not immediately release further details about his return to Pennsylvania or a subsequent court appearance.
The Swatara Township Police Department continued to list the homicide investigation as active Wednesday. Authorities have not announced a final motive, and the evidence described in the affidavit will remain subject to review as the criminal case proceeds.
Author note: Last updated October 21, 2026.