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Video Courtesy Of CBS Affiliate KDKA-TV Pittsburgh

PITTSBURGH - A man who claimed mood swings caused by an acne drug made him stab a high school cheerleader to death was convicted Monday of first-degree murder and was sentenced to life in prison.

John Mullarkey stabbed his ex-girlfriend Demi Cuccia 16 times on Aug. 15, 2007, then slit his own throat in a suicide attempt.

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PITTSBURGH - A teenager who fatally stabbed his 16-year-old cheerleader girlfriend claims his acne medication made him do it.

Prosecutors say John Mullarkey, now 20, told police he had been suffering mood swings caused by pimple medicine in the months before the August 15, 2007 murder of Demi Cuccia, his on-again, off-again girlfriend. Mullarkey then slashed his own throat in the moments after the killing.

Mullarkey had apparently gone to Cuccia’s home in suburban Pittsburgh that night to reconcile with her, but he brought a hunting knife with him, according to prosecutors.

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