Investigators believe the woman who caused a fatal wreck in Gila Bend earlier this month not only was driving under the influence but also did not have a valid driver's license.
Investigators believe Gibson lost control of her truck as she tried to round a curve on State Route 85 just north of Pima Street.
Gibson's truck crossed the center line and plowed head-on into a 2006 Nissan Pathfinder carrying a family.
Mario Lopez, 45, was driving the Pathfinder. He and one of his 21-year-old twin daughters, Melissa Ceballos, died at the scene. His wife, his other twin daughter and his two young grandchildren, ages 4 and 2, were injured. Three of them were air-lifted to the hospital. The youngest victim was transported by ground ambulance. The four survivors are expected to recover.
Gibson and her passenger, a 24-year-old man, were also injured. Emergency crews had to cut Gibson out of her vehicle.
Investigators believed early on that speeding was a factor in the deadly collision, but court paperwork released Monday revealed the details.
"A reconstruction of the collision was conducted and showed that Jaynee was travelling (sic) at a minimum speed of 75 mph in a 40 mph zone," according to court paperwork.
The car's computer confirmed that, showing that Gibson was going 77 mph three seconds before the crash and 70 mph at the time of impact.
"The ACM (airbag control module) also showed that at no time did Jaynee apply the brakes to slow down her vehicle," reads the arresting officer's probable cause statement.
Not only is the posted speed limit in the area when the crash happened 40 mph but the recommended speed for the curve where Gibson lost control is 35 mph. Gibson's truck was traveling twice that.
While at the hospital, Gibson "admitted to detectives that she smoked marijuana on the day of the collision but could not provide an exact time," according to court paperwork.
Detectives had already found marijuana and a glass pipe containing burnt marijuana in Gibson's truck.
While investigators said Gibson does not have a driver's license, it's not clear if she never got one or if it was suspended. It also was not known if Gibson has a history of DUI.
Gibson was booked on a variety of felony charges, including manslaughter and aggravated assault, as well as two drug-related counts.
Gila Bend is a little more than an hour southwest of Phoenix.Copyright 2016 KPHO/KTVK (KPHO Broadcasting Corporation). All rights reserved.