Jackee Raquel Contreras, the boy's mother, and her twin sister Jennifer Rachel Contreras were charged with the murder of 6-year-old Duke Flores Monday as authorities began searching a Victorville landfill for his body the same day. The search continued Tuesday as volunteers went through nearly 600 tons of trash to locate the body.
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Detectives believe the boy's body was placed in a dumpster.
MORE: Mother, aunt charged in Apple Valley boy's murder as detectives search landfill
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Mother, aunt of missing Apple Valley boy charged with murder
The San Bernardino County District Attorney's Office announced it had filed a single count of murder against each of the sisters.
Flores was reported missing from Apple Valley last week.
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The investigation into the missing boy with autism began about 10 p.m. last Thursday when Flores' grandmother requested a welfare check on him, authorities said. Deputies responded to a home in the 22000 block of Cherokee Avenue, where the boy's mother said he had not been seen in over a week.
The sisters are being held on $1,000,000 bail and are next scheduled to appear in court May 13.