Investigators say video, witnesses and location data transformed a fatal crash case into an allegation of premeditated violence.
BELLEVUE, Wash. — Prosecutors say the case against a 68-year-old man accused of killing an 88-year-old woman outside a Bellevue YMCA is built on a tightly linked chain of evidence, from parking-lot cameras and a Tesla recording to license-plate information and cellphone data that later traced his route south.
That evidentiary trail is why the case stands out. Investigators did not just identify a suspect vehicle after a deadly collision; they say they reconstructed waiting, movement, alignment, impact and flight in a way that supports a murder charge in the death of Shinko Oshino on Feb. 28. The same records, according to local reporting, also place Mark Alexander Adams at two later Tacoma crash scenes, widening the scope and urgency of the prosecution.
Public summaries of the probable-cause statement describe the first key evidence as time-stamped video. A white Toyota Camry entered the Bellevue Family YMCA lot around 6:45 a.m. and was seen circling more than once before returning to the same stall. Each time, the car backed in so its front faced the lower lot, according to the charging narrative reported by local media. About 55 minutes later, Oshino appeared on camera walking through that lower parking area. Investigators say the Camry then rolled out, turned slightly to match her path and accelerated. The footage, as described in court-based reporting, showed her carried on the hood for about 120 feet before the car braked and she fell in front of it. Prosecutors say the car then ran over her and kept going.
Witness accounts filled in what the cameras could not fully convey. One person told police the Camry did not slow after impact and was moving fast with the woman on the hood. Another said the shape falling from the vehicle first looked like a “fake body” until the car drove over it. At the scene, officers found Oshino in the lower level of the lot and nearby identification, while YMCA staff also helped confirm who she was. Bellevue firefighters attempted lifesaving measures, but she died at the scene. Those details mattered because they fixed the time, place and immediate aftermath before investigators began tracing the car itself. Once the license plate was recovered, authorities linked the Camry to Adams, giving detectives a named suspect rather than only a vehicle description.
The evidence chain did not end in Bellevue. According to local reports on the court papers, a Bellevue detective obtained or used cellphone location information that placed Adams at the YMCA, in Auburn and near two Tacoma hit-and-run scenes later that day. In the first Tacoma incident, a skateboarder said the driver matched his speed before striking him. In the second, surveillance footage reportedly showed the same vehicle circling a gas station, moving toward one pedestrian, then hitting another from behind. One of those victims suffered a spinal fracture. The route south, combined with the phone data, appears central to the state’s broader narrative that the Bellevue death was not an isolated traffic event but part of a sustained course of violent driving.
Investigators ultimately tracked Adams to Port Townsend, where he was arrested on March 1, according to local coverage. By then, prosecutors had enough to seek murder and felony hit-and-run charges, describe the car as a weapon and ask for $5 million bail. The court record made public through media accounts does not spell out a motive, and no prior connection between Oshino and Adams has been publicly established. Still, the charging theory relies less on motive than on sequence: a long wait, repeated circling, a final approach lined up with the victim’s path, and continued driving after impact. That sequence is the backbone of the prosecution’s argument that intent can be inferred from conduct caught on camera and matched to the suspect’s movements throughout the day.
The court phase has added another layer to the case. Adams’ arraignment led to a competency examination order, meaning the evidence question and the defendant’s ability to proceed now move side by side. Public reporting has also noted prior legal and mental-health history involving Adams, including a family protection order and an old escape from Western State Hospital, details prosecutors used when arguing he posed a danger. But the proof of the Bellevue killing remains rooted in physical records and witness testimony, not in biography. As the case goes forward, the reliability and interpretation of those videos, sightings and location records are likely to remain at the center of every major hearing.
For now, the prosecution’s roadmap is clear: show how one white Camry, one morning’s video trail and one day’s travel path became the foundation of a murder case still awaiting its next court milestone.
Author note: Last updated April 1, 2026.