Celeste Rivas' Body Discovered Frozen, Cause of Death Likely 'Undetermined'

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Celeste Rivas 's body had been frozen, and as a result, it looks the L.A. County Medical Examiner will not be able to establish a cause of death ... sources directly connected to the investigation tell TMZ.

According to those sources, the medical examiner received the body in horrendous condition ... it was decapitated, and, while the torso was intact, the limbs had been removed and cut into multiple pieces. Getty

We're told all of the body parts were "partially frozen" ... and had, apparently, been thawing out while sitting in the trunk of D4vd 's Tesla.

Remember, D4vd's vehicle had not been moved for several days when it was parked on a Hollywood Hills street near his rental home ... which resulted in it getting towed, and then the body being fou