The Highway Patrol arrested 18-year-old Fernanda Lopez and 23-year-old Moises Guerrero on Wednesday.
They say Lopez was in the truck with the driver, 18-year old Rogelio Alvarez- Maravilla, when it hit Gavin Gladding.
Investigators are accusing Guerrero of making repairs to the truck after that hit and run crash.
The two were arrested as accessories to the crime after an investigation that involved more than 20 search warrants and data recovered from a computer chip on the truck.
Alvarez-Maravilla was arrested last month.
He's accused of vehicular manslaughter, hit and run, and driving without a license when he hit Gladding who had been on a morning jog along Friant Road in Fresno County.
Jail booking records (and court documents) say Fernanda Jakeline Lopez is actually 18 years old, not 16, so she was booked into the Fresno County jail this morning.— Corin Hoggard (@corinhoggard) October 10, 2018
#BREAKING: @CHPCentralDiv has arrested two more people for being accessories in the death of @clovisusd vice principal Gavin Gladding, including the 16-year-old girl who was in the truck with Rogelio Alvarez Maravilla. @ABC30— Corin Hoggard (@corinhoggard) October 10, 2018
Also arrested: a friend who helped fix parts of the truck. pic.twitter.com/zGV4T5CMCO— Corin Hoggard (@corinhoggard) October 10, 2018
"We have developed through the investigation that he is complicit in the investigation and complicit in the crime and assisted in repairing the vehicle in question," said Sergeant Dave Salcido of Highway Patrol.
The two have since bonded out of jail.
The CHP says both Lopez and Guerrero were aware the pick up truck hit someone on Sept. 16 and have not been cooperative with the investigation.