Emergency crews are investigating a fatal wreck along Interstate 285 that brought rush hour traffic to a halt.

The wreck happened just after 4:30 p.m. along I-285 east bound, near Interstate 75 and the Chattahoochee River. All lanes of I-285 we re-opened just after 6:30 p.m.

Cobb County police confirmed one person was killed in the wreck that included a pickup truck, a semi-truck and a car.

A passenger inside the pickup truck was killed in the wreck.  Cobb police told Channel 2's Tony Thomas the truck rolled several times from the impact of the wreck.

Investigators say witnesses and drivers involved are giving conflicting stories about what happened so they can't determine the chain of events. Officers marked each piece of debris and gouge mark in the pavement for later use before opening the road back to traffic.

"We believe the pickup truck itself rolled. We don't know what vehicle made contact with what vehicle first, second or third," Cobb County Sgt. Dana Pierce told Thomas.

Police said the driver of the pickup was taken to an area hospital in critical condition.

Channel 2's Jason Durden flew over the wreck in News Chopper 2 and showed a massive traffic back up along the interstate during the rush hour.

Durden said traffic had to be diverted off of I-285 in the area of the wreck, causing major back-ups along Ackers Mills, Cumberland Parkway, Cobb Parkway and Powers Ferry Road.