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Jack Pembleton was a detective in the Tarsonis Police Force, known for always wearing large mirror shades.
Former fellow detective Malcolm Kelerchian had uncharitable thoughts about Pembleton's level of intelligence.
At some point, Pembleton developed a grudge against fellow officer Grabowski, due to Grabowski marrying a woman Pembleton claimed to have loved.
Not long after the destruction of Mar Sara, Pembleton was assigned to investigate the murder of the Terra Family and hundreds of associated deaths. Pembleton hoped to get a good clearance rate from solving the hundreds of deaths, but Kelerchian pointed out the victims were mostly killed by psionics rather than terrorists.
Detective Jack Pembleton shares the surname of a detective character from the TV series Homicide, Life on the Street.