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

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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.

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.

Source: Aurora Police Department press conference

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

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

Source: The Chicago Sun-Times

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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."

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."

Source: The Chicago Sun-Times

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

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

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.

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.

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.

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

Source: Aurora Police Department press conference

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

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

Source: Aurora Police Department press conference