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Arthur Roan, of Vanderwagen, N.M., was in San Diego with family to attend his older brother's graduation from Marine Corps Recruit Depot, the medical examiner's office reported.

San Diego police and the medical examiner's office said the boy wandered away from his family's hotel room at about 7:25 p.m. Thursday and onto Nimitz Boulevard near Rosecrans Street when he was struck by a Toyota Tacoma driven by a 54-year-old man.

Bystanders rushed to help the boy.

"He was bleeding a lot from the mouth and, I don't know, the neck," said one witness.

The child was rushed to UC San Diego Medical Center where he underwent surgery to control bleeding, and was later transferred to Rady Children's Hospital where he succumbed to his injuries in the pediatric intensive care unit just before 2 a.m., the medical examiner's office said.

There were no indications that the driver of the truck was at fault for the accident, SDPD public affairs Lt. Andra Brown said. The man was fully cooperative with investigators, she said.

Police said they don't believe drugs or alcohol were a factor in the crash. The driver of the pickup truck was not cited or arrested.