The cause of death of 8-month-old King Jay Davila was listed as homicide by blunt force trauma, according to News 4 San Antonio.
The body of Davila was reportedly found after the baby's father lead authorities to it on Jan. 4.
According to News 4 San Antonio, the child's body was found in a backpack, buried under a bridge on the city's northeast side. The body was wrapped in a blanket.
The medical examiner's office said that Davila's death was ruled homicide by blunt force trauma. No other details were released.
San Antonio police arrested three people in connection with the boy's disappearance.
According to KSAT, Police Chief William McManus said they are charging the father, grandmother and cousin in connection with the disappearance of King Jay Davila. Police said they are being charged with tampering with evidence in the missing baby case.
McManus said the father, Christopher Davila, the baby's grandmother, Beatrice Sampayo and the cousin, Angie Torres, are in custody.
It was reported that Christopher may have "severely injured" King Jay.
Initially, Christopher said that Davila was taken by an unknown woman after being left in a car at a gas station.
According to KSAT, McManus said the boy's father told police the woman was his cousin.
Davila was taken in for questioning and will be charged with child endangerment. They said Davila left the car running and the driver's door was open while he went inside a convenience store to make a purchase.
Davila told police that a woman who was walking down the street got into the car and drove off.
The car, a white Dodge Dart, was found near Rodriguez Park with no baby, no car seat and no keys, according to KSAT.
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