Philadelphia man pleads guilty in deadly Monroe County crash

Mark Rideout admitted to homicide by vehicle while DUI and other charges related to the fatal 2023 collision.

Apr. 10, 2026 at 9:51pm

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An extreme close-up photograph of a shattered car windshield, the jagged glass fragments conceptually representing the devastation caused by a deadly DUI crash.The aftermath of a deadly DUI crash on a rural Pennsylvania highway exposes the human toll of impaired driving.Philadelphia Today

A 45-year-old Philadelphia man named Mark Rideout has pleaded guilty to homicide by vehicle while DUI, involuntary manslaughter, and other charges stemming from a March 2023 crash in Monroe County, Pennsylvania that left three people dead. Investigators say Rideout, the driver of a tractor-trailer, was under the influence of drugs when his vehicle crossed into oncoming traffic on Route 33 near Saylorsburg and collided with multiple cars.

Why it matters

Impaired driving continues to be a major public safety issue, with fatal crashes involving drugs or alcohol accounting for over a third of all traffic fatalities nationwide. This high-profile case in the Pocono Mountains region highlights the tragic human toll of these preventable incidents and the ongoing need for stricter enforcement and education around substance-impaired driving.

The details

According to authorities, in March 2023 Rideout's tractor-trailer crossed the center line on Route 33 near Saylorsburg and collided head-on with several passenger vehicles, resulting in the deaths of three people. Rideout was later determined to have been under the influence of drugs at the time of the crash. He has now pleaded guilty to a slew of charges, including homicide by vehicle while DUI and involuntary manslaughter.

  • The fatal crash occurred in March 2023 on Route 33 near Saylorsburg, Pennsylvania.
  • Rideout pleaded guilty to the charges in April 2026.

The players

Mark Rideout

A 45-year-old Philadelphia resident who pleaded guilty to homicide by vehicle while DUI, involuntary manslaughter, and other charges related to a 2023 crash that killed three people.

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What’s next

Rideout is scheduled to be sentenced for his crimes in June 2026.

The takeaway

This tragic case underscores the devastating human toll of substance-impaired driving and the ongoing need for stronger enforcement, education, and public awareness campaigns to prevent such preventable incidents from occurring.