An autopsy checked for blood clots that could have resulted from his earlier injuries but found none, Johnson said. Additional tests are being done, he said. When the boy reached Kadlec he had a high level of acidosis - an excessive acidity of body fluids. That can be caused by several medical conditions. Johnson said ingesting toxic materials would be another possibility, although unlikely.
Officials have no suspicions of criminal activity.
The boy was accidentally injured Oct. 13 while riding his bicycle in a driveway beside his home at 61104 43rd Private Road N.W. in Benton City. The boy's grandfather, Terry Baumgartner, apparently struck the boy while backing a pickup into his driveway. Leif stopped breathing, but the grandfather performed cardiopulmonary resuscitation and revived the boy before emergency crews arrived. Leif was taken to Kadlec in Richland, then flown to Harborview Medical Center in Seattle. A family member said at the time his lungs were bruised and his right leg broken.