The investigation continues into a high-speed collision on State Route 169 that killed a 26-year-old Renton man and sent a woman and her two toddler twin sons to Harborview Medical Center last Friday.

The investigation includes drug and alcohol tests, precise measurements to determine speed and interviews with witnesses, all designed to determine what happened and where to place responsibility for the accident.

Aaron Turnage’s death was ruled an accident on Monday by the King County Medical Examiner’s Office. He died at the scene of blunt-force trauma to his head, body and limbs.

The medical examiner won’t comment further on details about Turnage’s death, including whether he suffered a seizure just prior to the accident. In comments on RentonReporter.com, there has been a discussion about the possibility a seizure occurred.

Renton Police Commander Paul Cline said police have received information about a possible seizure. However, he said there’s nothing now to indicate one occurred, although it hasn’t been ruled out. Confirmation of a medical factor in an accident would come from the medical examiner.

The driver of the Toyota, a 42-year-old Renton woman whose name hasn’t been released, and one of her twin sons, about 18 months old, remained in Harborview Medical Center mid-week in serious condition, according to Cline. Her other son was released from the hospital.

Friday’s was one of six serious accidents in Renton in recent weeks that have killed two, including a Kent woman on the Benson Highway, and injured several others, including a two students in Renton schools. The driver involved in the Benson crash pleaded not guilty to vehicular homicide on Wednesday.

That latter accident occurred in southwest Renton on May 10 when a Kia crashed into a tree, injuring three young men. One of the three, a 19-year-old man who was in the car’s backseat, has been released from Harborview, while the other two remained hospitalized there mid-week in serious condition. One of those still hospitalized is an 18-year-old senior at Renton High School and the other one is a 17-year-old junior at Sartori Education Center, an alternative high school in the district. Their names haven’t been released.

Cline said the work of the accident reconstruction teams will take “some time” to complete the investigation of the accident on SR 169. Eventually, county prosecutors could review the investigation; it’s possible the accident could result in civil lawsuits, Cline said.

Because of Turnage’s death, there would be no criminal charges, according to Dan Donohoe, a spokesman for the prosecutor’s office.

The actions of the driver of the Toyota 4Runner struck by Turnage’s Hyundai are being investigated, although there’s nothing now that indicate she is to blame for the accident, Cline said. At least initially, Cline said, “it’s appearing more that he (Turnage) is at fault in the accident.”

The accident last Friday happened at about 2:15 p.m. in the 2400 block of State Route 169, in front of Bill and John’s Food Mart just east of the Renton Community Center.

The collision occurred after Turnage rounded a curve headed into Renton in his red Hyundai Tiburon, crossed into an oncoming lane going sideways and crashed head-on into the Toyota 4Runner. Witnesses said the collision sounded like a gunshot and sent both vehicles into the air.

Kim Greenfield saw the Tiburon coming around the corner just before the accident.

“He was fish-tailing,” Greenfield said. At one point, the car was on two wheels, he said.

The Tiburon, now sideways in the oncoming lane, “nailed that lady head-on,” he said.

Greenfield and another man, Scotty Dunn, rushed over to help the man. They checked his pulse.

“He was gone,” Greenfield said.

Two other men working nearby rushed to help the mother and the two little boys in the Toyota.

Those men, T.J. Steiler and Richard Loewellen, removed the two boys from the Toyota, still in their carseats. The two boys seemed to be in shock, they said. The woman was conscious.

The accident closed SR 169 was closed for hours, backing up traffic in downtown Renton and on freeways in the area.