'I killed my sister, but I don't care'

I fucking killed my sister, I know I'm going to jail for life.

An 18-year-old woman from California livestreamed on Instagram the moment her auto span into a deadly wreck and the shocking aftermath of her bloodied and dying younger sister.

Obdulia Sanchez was allegedly filming herself singing to music behind the wheel when she lost control - causing the vehicle to swerve across lanes, smash through a wire fence and overturn in a field.

Obdulia Sanchez, 18, was singing and listening to music with her sister and another 14-year-old girl in the backseat when the vehicle she was driving suddenly veered off the roadway.

Authorities say a graphic live Instagram video shows Sanchez before, during and after the deadly crash.

"I fu-king killed my sister, OK?"

"This is the last thing I wanted to happen to us, but it just did", she added.

Jacqueline was ejected from the vehicle during the crash in Los Banos, near Henry Miller Road and Highway 165. "We about to die", Sanchez can be heard saying in the video.

Mary Hernandez of Stockton viewed and recorded the live stream, unsure if the shocking footage was real. "I'm sorry baby. I'm a hold it down".

"I recorded it and posted it mainly because as someone who uses Snapchat I see a lot of people driving with their Snapchats doing what she was doing so to me it was like an eye opener".

CHP reports the 18-year-old overcorrected the Buick when it traveled off the edge of the road.

Sanchez is in custody facing charges of vehicular manslaughter and DUI. The driver was reportedly combative and agitated during the incident, screaming at officers that her sister was dead, local newspaper The Fresno Bee reported.

According to her family, Jacqueline was preparing for her Quinceanera, a Hispanic tradition which celebrates a girl's 15th birthday. Jacqueline's family has set up a GoFundMe page for raising funds for her funeral.