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Murder

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On Jan. 24, 2012, Robert Burton was found slumped over the wheel of his truck. He had attempted suicide after stabbing his former girlfriend, Melissa Dohme. Detectives Tom Dawe and Joseph Ruhlin walk "48 Hours" through the investigation and the evidence

On Jan. 24, 2012, Robert Burton was found slumped over the wheel of his truck. He had attempted suicide after stabbing his former girlfriend, Melissa Dohme. Detectives Tom Dawe and Joseph Ruhlin walk "48 Hours" through the investigation and the evidence.

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On Oct. 25, 2011, Melissa Dohme called 911 as she was being attacked by her ex-boyfriend. Dohme says he had assaulted and threatened her in the past, but she kept it secret until the call to police. Three months later, Burton stabbed her 32 times

On Oct. 25, 2011, Melissa Dohme called 911 as she was being attacked by her ex-boyfriend, Robert Burton. Dohme says Burton had assaulted and threatened her in the past, but she kept it secret until the call to police Three months later, Burton stabbed her 32 times.

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Special night: A key witness in the murder case against an Arizona stockbroker accused of killing his ex-wife speaks out on network television for the first time in an interview with "48 Hours." Maureen Maher reports Monday, May 26 at 10 p.m. ET/PT on CBS

Special night: A key witness in the murder case against an Arizona stockbroker accused of killing his ex-wife speaks out on network television for the first time in an interview with "48 Hours." Maureen Maher has the story Monday, May 26 at 10 p.m. ET/PT on CBS.

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