A suicide note discovered by Orange County sheriff's investigators suggests that last week's shooting rampage that left four dead was planned, authorities said.
Ali Syed, a 20-year-old college student, killed a woman in his parents' Ladera Ranch home in the early morning hours of Feb. 19, then committed a series of violent carjackings in Tustin and Santa Ana, killing two men before turning the gun on himself.
A document titled "suicide note" was created about an hour before Syed's panicked mother called 911 to report a shooting, said sheriff's investigator Dan Salcedo.
The note, about half a page long, was retrieved from Syed's bedroom computer, he said.
Salcedo declined to say what was in the letter. But he said it contained statements that indicated Syed, an avid video game player, aimed to kill other people and himself that day.