Ten cases that highlight the blurry line between aggression and self-defense.

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Ex-porn star Jennifer Marchant, 23, has pleaded not guilty to the February 6, 2013, stabbing death of her boyfriend Ralph Stone, 24, father of her daughter, 2. Until last year Marchant worked as an adult film actress under the stage name Scarlett Rouge. Marchant is claiming that she acted in self-defense.

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Last week we brought you the story of a terrified burglar who, held at gunpoint by an angry homeowner, called 911 on himself. Today we bring you the story of a would-be robber, who got the smack down of his life when he broke into the home of a personal trainer, who specializes in boxing and kickboxing.

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Michael Dunn, 45, of Brevard County Florida, allegedly shot up an SUV that was blaring loud music at a gas station, killing a teen.

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A man who in 2009 shot his drunk father dead to protect his mother answered questions about his case in a Reddit AMA (Ask Me Anything.) Justin James Evans, 20 at the time, shot his father in the stomach at their Spartanburg, S.C., home. The father, Kenneth Evans, 45, died later at the hospital. Evans told police that his father was holding a knife to his mother’s throat at the time of the shooting. He was never charged.

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New Haven, Conn., police have reportedly shifted the focus of their investigation to discovering the dead youth’s reasons for sneaking around outside his home at one o’clock in the morning, armed and masked.

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A Cape Coral, Fla., man is under arrest for killing an unarmed door-to-door salesman who was on his property to sell steak and lobster tails. He later told police, “I was in fear.”

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