*Updated March 18, 2025
Kyle Harrison, the 25-year-old street racer who was responsible for the 2022 death of a San Carlos couple, has died in jail. He died whilst in custody at the Maple Street Correctional Center, according to a statement by The San Mateo County Sheriff’s Department.
Shortly before 4:50 p.m., Harrison received a safety check in the group pod. At around 4:50 p.m., however, the inmate was said to have been found unresponsive in a housing unit at the facility. Life-saving measures were immediately administered by personnel of the sheriff’s office before medical personnel arrived.
Harrison was pronounced dead at Maple Street shortly after by emergency medical services (EMS). His cause of death is currently being privately investigated by the San Mateo County District Attorney’s Office, the San Mateo County Coroner’s Office, and Sheriff’s Detectives, but no cause of death can be declared until the coroner’s office makes a determination.
Convicted a mere three weeks prior to his death for vehicular manslaughter, Harrison was accused of killing a couple in a street racing incident on Nov. 4, 2022. While driving a BMW, he was street-racing a juvenile in a Mercedes-Benz.
According to the prosecution’s memorandum, at a speed of over 100 miles per hour, Harrison and the juvenile perpetrator raced from the intersection of El Camino and Howard Avenue. It was there that they crashed into a Chevrolet Bolt – the car of 44-year-old Gregory Ammen and his wife, 42-year-old Grace Spiridon – turning onto El Camino from Finger Avenue.
Ammen and Spiridon were in the driver and passenger seats of their car when it went airborne and launched 100 feet into the air upon the impact. The family’s vehicle was immediately crushed, killing both front-seat passengers instantly.
In the car were also two 7-year-old twins, Madison Ammen and Olivia Ammen, who survived. Harrison fled the scene before later being captured and held on eight charges without bail. In January 2025, he was sentenced to eight years in jail.
A GoFundMe was created to support the orphaned twins following the death of their parents, which collected over half a million dollars.
Harrison pleaded no contest to two counts of felony vehicular manslaughter and one count of felony engaging in a speed contest that resulted in death or great bodily injury. The judge ruled with the maximum sentence for the charges Harrison was facing.
The investigation into his death will remain private until it concludes, at which point the sheriff’s office will make their findings public.
