The 11-year-old boy's mother reportedly watched her son's stabbing on a home security camera before calling 911, sparking the chase that ended with the father's death

Marvin Morales, a former deputy suspected of fatally stabbing his 11-year-old child in Elk Grove, was shot and killed by law enforcement along Interstate 5 near Lodi.

ELK GROVE, California (KCRA) -- Sacramento Sheriff Jim Cooper was among the first to spot the former deputy on the run after he fatally stabbed his 11-year-old son at their Elk Grove home. "I didn't want him to see me because he knows me," said Cooper.

The California Department of Justice has opened an investigation into the fatal shooting by law enforcement of a former Sacramento County sheriff's deputy, the state agency said Wednesday.