The Hart family SUV is seen upside down on the rocky shoreline at the bottom of a 100-foot cliff along a remote stretch in Mendocino County, California, about 180 miles north of San Francisco.
A couple vacationing near the coast spotted the body floating in the surf not far from the crash site on Saturday afternoon, the Mendocino County Sheriff's Office said.
The Mendocino Sheriff's office shared the news on Twitter, saying that the body "appears to be an African American female".
"Positive identification will most likely be done by DNA analysis, a process that can take several weeks", the Sherriff's Office said. Though authorities have recovered the bodies of adoptive mothers Sarah and Jennifer Hart, and three of their adoptive children, Markis Hart, 19; Jeremiah Hart, 14; and Abigail Hart, 14, their three other adoptive children-Devonte Hart, 15; Sierra Hart, 15; and Hannah Hart; 16-have yet to be located.
The two women in the crash were a married couple and had been under investigation by police and child services officials in the three states where they had lived.
"They say (the child) has been constantly going through food issues, where (child) will steal people's food at school or eat out of garbage cans or off the floor", according to the police report.
Authorities believe the mysterious crash may have been intentional.
Investigators have also said the SUV's software indicates the vehicle stopped at the highway pullout before it accelerated straight off the cliff, according to The Associated Press.
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She is sentenced to community service and one year of probation.
Days before the family left Washington, child services officials there had begun investigating the Harts for "alleged abuse or neglect".
There were no signs of the other two children, authorities said Saturday.
"About two o'clock this morning, my son came down and woke us up. Memories will last a lifetime and each and every person who knew Eythan, I'm sure, has countless happy memories to think back on", said Taylor.
In this Tuesday, Nov. 25, 2014 photo, Portland police Sgt. Bret Barnum, left, and Devonte Hart, 12, hug at a rally in Portland, Oregon.
Family and friends of the Harts told detectives the family traveled together and was rarely apart, the sheriff's office said.
In the affidavit requesting the search warrant, a Clark County sheriff's deputy says he is seeking evidence on what happened to the family, including possible suicide notes.
"I'm to the point where I no longer am calling this an accident", Allman told HLN.