Investigators say 25-year-old Melissa Leonardo and 19-year-old Daniel Gross left 19-year-old Lizette Andrea Cuesta to die, bleeding from multiple stab wounds and crawling on her stomach, approximately 100 yards based on a trail of blood.
First responders airlifted the victim to Eden Medical Center.
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She later died at the hospital but before she did, she managed to tell investigators who assaulted her.
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Sheriff's officials say Cuesta was friends with the two suspects and got into the vehicle willingly.
"It's very rare that you can get one of these statements and I don't know how descriptive it was but it was descriptive enough to get us to Modesto," said Alameda County Sheriff's Sgt. Ray Kelly. "I think she showed incredible internal strength to get through this and to live for as long as she did live."
That information led them to arrest of Leonardo and Gross in Modesto as suspects in her death. Neighbors of the home in Modesto described the scene as police swarmed in to make the arrests. They described a woman who was very pregnant being arrested followed by Daniel Gross. One boy said a sniper team was set up in his treehouse looking down on the backyard next door.