Here's what we know about Gary Martin, suspected of killing 5 civilians and injuring 5 police officers in Aurora

Aurora police chief Kristen Ziman said they believe Martin was being let go from the company on Friday. Martin worked at the company for 15 years.

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Source: Aurora Police Department press conference

A woman who identified herself as Martin's mother said he was "way too stressed out."

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Source: The Chicago Sun-Times

In 1994, Martin was convicted of stabbing a woman in Mississippi, according to court records. Six year later, he was found to have illegally modified his car speakers and received a notice for "squealing or screeching tires."

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Source: The Chicago Sun-Times

Martin lived in Aurora, but it was unclear if he was a life-long resident.

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Source: Aurora Police Department press conference

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Two of four police officers who first responded to the incident and entered the building were 'fired upon immediately' by Martin. He was reportedly armed with Smith & Wesson handgun. The initial gunfight lasted five minutes.

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Source: Aurora Police Department press conference

Preliminary evidence suggested Martin originally fired from a window. The entire duration of the incident lasted one hour and 35 minutes.

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Source: Aurora Police Department press conference

Police have yet to determine a motive and were looking at his criminal history.

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Source: Aurora Police Department press conference