Investigators found the document entitled "Suicide Note" on Ali Syed's computer desktop. The document reportedly gives a revealing look at Syed's state of mind prior to the deadly shooting rampage and indicates the events were pre-meditated and planned.
Police say the note was created on Feb. 19 within an hour of the 911 call made by the suspect's mother and father. Syed's parents found Courtney Aoki, 20, of Buena Park fatally shot inside their home.
The suspect, who lived at the residence, reportedly shot Aoki then drove more than 20 miles across Orange County; shooting at vehicles on the 55 Freeway, carjacking and killing three innocent people in Tustin and Santa Ana.
Orange County Sheriff's Homicide investigators have not found any prior connection between the suspect and any of his victims.
The investigation is ongoing.