A truck driver died of a heart attack in Colorado on Monday, despite the efforts of a good Samaritan who performed CPR.

The incident occurred on Monday, January 29th at approximately 11:30 a.m. in Boulder County, Colorado.

According to the Boulder County Sheriff’s Office, a semi truck was traveling in the eastbound lanes of Highway 36 when the truck driver had a heart attack and lost control, sending the semi truck off road. A passing motorist then noticed that something was wrong and called the police before rushing to the driver and performing CPR.

As paramedics made their way to the scene, the ambulance was involved in a second crash, lengthening their response time. When rescue crews finally arrived, the 61-year-old unidentified truck driver was transported to a nearby hospital but was later pronounced dead, reported Boulder County News.

No other injuries were reported.

Two eastbound lanes of Highway 36 were closed for at least an hour as officials investigated the incident, but the lanes have since been reopened and the accident, cleared.