OAKLAND -- A motorcyclist who died last week in a West Oakland chain-reaction collision near the Adeline Street Bridge was run over by a car driven by his son before another vehicle flipped and landed on top of his body, police said Tuesday.

Klauus Torres, 43, died in the wreck that happened about 10:50 p.m. July 31 on Adeline Street, just south of Third Street, police said.

The incident began when Torres crashed his motorcycle into a pole, was thrown from the bike and then landed in the roadway police said.

Torres' 18-year-old son, driving a Mercedes-Benz S500 that was following his father's motorcycle, then ran over his father's body. The son, along with three other passengers in the Mercedes, were not injured.

Shortly after, another vehicle stopped in an attempt to block the roadway to protect Torres' body. But police said a sport utility vehicle came speeding by, lost control, flipped and landed on Torres' body.

Torres suffered catastrophic injuries and was pronounced dead at the scene, police said.

Police are still investigating why Torres hit the pole. They're also looking into whether charges will be filed against the driver of the SUV, who police say was speeding.

It is not yet known whether drugs or alcohol were a factor in the wreck.

Contact Natalie Neysa Alund at 510-293-2469. Follow her at Twitter.com/nataliealund.