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An off-duty San Bernardino County Sheriff’s Department Deputy was killed in a suspected DUI traffic collision in Chino early Sunday morning, the Sheriff’s Department said.

Officers responded to a collision at around 12:30 a.m. on the corner of Euclid and Edison Avenues to find that deputy Nicholas O’Loughlin’s vehicle was struck by another vehicle, according to the Chino Police Department.

O’Loughlin was traveling south on Euclid Avenue when he was struck by a vehicle driven by Yijie Mao, 26, of Alhambra, who was traveling west on Edison Avenue, police said.

The 28-year-old deputy was pronounced dead at the scene, Chino Police said a preliminary investigation revealed.

Mao was determined to be under the influence of alcohol and marijuana, and arrested on suspicion of driving under the influence and vehicular manslaughter, police said.

The San Bernardino County Sheriff’s Department announced O’Loughlin’s death.

“Nicholas left a positive impression on his friends and coworkers and will be deeply missed,” the Sheriff’s Department said in a Facebook post. “Rest easy brother.”

The road was closed for around nine hours while investigators worked at the scene.

Mao was being held at a San Bernardino detention center with his bail set at $250,000, according to public records.

Anyone with information was asked to call Chino Police Department Officer Bloch at 909-334-3018 or email