The elder Knotts died of pneumonia when Jesse Donald was 13 years old .
Afflicted with schizophrenia and alcoholism , he sometimes terrorized Knotts with a knife , causing Knotts to turn inward at an early age .
The elder Knotts died of pneumonia when Knotts   was 13 years old .
Afflicted with schizophrenia and alcoholism , he sometimes terrorized Knotts with a knife , causing Knotts to turn inward at an early age .