"I just did it for the fun of it," Brenda told reporters who reached her by phone during the rampage. "I don't like Mondays. This livens up the day."
When the schoolgirl sniper surrendered six hours later, two adults were dead, principal Burton Wragg and janitor Mike Suchar, and eight children and a police officer were wounded.
TWISTED DOUBLE LIFE
Friends weren't surprised by Brenda's behavior, revealing the troubled teen led a twisted double life. On one hand, she was quiet and well-behaved, an animal lover who won a Humane Society award.
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As hundreds of police surrounded the house across from the school where she lived with her divorced dad, Brenda calmly walked out, and laid down her .22 rifle and the Jan. 29, 1979, ordeal was over.
Before the shooting, she announced to classmates she wanted to "do something big to get on TV."
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"She must have loved every minute," said a close friend.
The slaughter was made even more notorious by the Boomtown Rats hit single "I Don't Like Mondays" which Spencer's family tried to get banned in the U.S.
Now 50, she remains in prison and has been denied parole four times.
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