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A 19-year-old Florida State University student with no criminal record fatally stabbed a couple at random in their garage, wounded their neighbor and was biting the dead man's face when deputies finally subdued him, authorities said Tuesday. Martin County Sheriff William Snyder told reporters that Austin Harrouff may have been on hallucinogenic drugs when he attacked Michelle Mishcon, 53, and John Stevens, 59, at their Tequesta home late Monday. The teen suspect is now in grave condition at a local hospital suffering from intestinal damage, police say.