Suspect Arrested in Fatal Shooting of Rancho Cucamonga Security Guard

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A suspect was arrested Sunday in the killing of a security guard who was fatally shot during a robbery at a liquor store in Rancho Cucamonga, authorities said.

Diego Dominguez, 36, of Rancho Cucamonga was taken into custody about 8:30 a.m. Sunday by detectives who served warrants on his vehicles and residence in the 9900 block of Placer Street (map), according to a news release issued by the San Bernadino County Sheriff’s Department.


A security guard was fatally shot during a robbery at a market in Rancho Cucamonga, Feb. 23, 2014. (Credit: RMG News)

Dominguez was stopped and detained after leaving the residence in a vehicle, the release said. He was then arrested on suspicion of robbery and murder, and booked at the West Valley Detention Center.

The fatal incident occurred Saturday at 11:20 p.m. at The Brothers Liquor, located at 10080 Arrow Route (map), according to the Sheriff’s Department.

There were two clerks inside the mini-mart when a gunman walked inside and demanded cash, investigators said.

One clerk fled, and the other remained behind the counter, according to the Sheriff’s Department.

“As the suspect was getting ready to leave, a security guard had driven up.  That’s when an altercation occurred… The security guard was hit, and the suspect fled the scene,” said Sheriff’s spokesman Randy Naquin.


Dean Vedol Sena, 45, was shot and killed during a robbery at a Rancho Cucamonga liquor store on Saturday, Feb. 23, 2014.

The security guard was later identified by authorities as 45-year-old Dean Vedol Sena.

Sena was armed, but did not fire his weapon, the Sheriff’ Department said. He suffered multiple gunshot wounds.

Paramedics rushed him to San Antonio Community Hospital in Upland, where he was pronounced dead.

Anyone with information is urged to call Detective Joseph Janowicz or Sgt. Chris Fisher at 909-387-3589. Those who wish to remain anonymous are urged to call the We-Tip Hotline at 800-782-7463, or visit

KTLA 5’s Dave Mecham contributed to this report.

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