Mr McMichael's companion in Downing Street was John White, convicted of a brutal double murder.
In a statement, police said this was a live investigation into a particularly brutal murder and it was not appropriate to discuss specific issues regarding witnesses or suspects.
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The US embassy in the capital, Port Moresby, condemned the killing as a "brutal murder", the AFP news agency reports, and evidence of "pervasive gender-based violence" in Papua New Guinea.
The detective who led an investigation into a pensioner's "brutal" murder at a pet shop 20 years ago hopes forensic advances will now trap the killer.
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Only this past week, Twitter has been the main avenue for a campaign for change following the brutal rape and murder of a 17-year-old South African girl.
It was a "normal lazy Sunday morning" that ended in the brutal and senseless murder of a promising Cardiff teenager.
The Los Angeles Police Department brings him in from the cold to help solve the brutal murder of a millionaire yoga mogul.
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Among the artifacts to be exhibited are a segregated rail car, slave clothing and the casket of Emmett Till, whose brutal 1955 murder in Mississippi was a spark in the early civil rights movement.
The repeal of the 1971 Sorcery Act, which acknowledged the accusation of sorcery as a plausible defence in murder cases, came after a series of brutal public killings.
In London, authorities and the public are grappling with the brutal murder yesterday of a British soldier who was hacked to death on the street.
His biggest problem was the brutal murder in January of a news photographer, Jose Luis Cabezas.
The incident happened barely two months after the brutal gang rape and murder of a student in Delhi that caused outrage across India.
BBC: India parliament uproar over rape and murder of sisters
The Paramount film, which opens April 26 and is directed by Michael Bay of "Transformers" and "Armageddon" fame, is adapted from a series of Miami New Times articles about a group of 1990s bodybuilders who hatched a brutal get-rich-quick kidnapping scheme that eventually escalated to murder.
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