(ennifer)

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Always? Jennifer San Marco. Mass murders are no more horrific than single, double or serial murders... often committed by women.
That's not what you asked. :P But, not that I can find. However, in 2006 Jennifer San Marco shot her neighbor and 6 co-workers
Hey ever hear of Jennifer San Marco or Amy Bishop? However, Women serial killers usually don't commit mass shootings.
Also Jennifer San Marco.
'Always'? Jennifer san Marco, who shot dead 7 in 2006? Khoua, 1996, who strangled her 6 children? I could go on. Do your research.