Hamilton police said he was indicted after allegedly threatening an airport and a hospital.
Investigators say the charges are related to online threats against Hamilton's John C. Munro International Airport and Hamilton Health Sciences.
Police officers ransacked a Hamilton home Friday and said they had arrested a 22-year-old local man in an uneventful manner.
The police said he was charged with three death threats that caused his death.
In addition, misunderstanding is also accused of unauthorized use of a computer and non-compliance with recognition.
The police said he was being held for bail trial.