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Court docs show 'confession' from man accused of killing Yarmouth Police Sgt.

Chilling new details are emerging about the shooting death of Yarmouth Police Sergeant Sean Gannon.

Boston 25 News obtained court documents that reveal the actions of the accused killer Thomas Latanowich immediately after the fatal encounter.

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According to State Police, Latanowich fired a flurry of frantic voicemails and text messages to his ex-girlfriend, allegedly confessing to shooting Gannon and his K-9 partner, Nero.

Gannon was trying to serve an arrest warrant for Latanowich on April 12 in Marstons Mills when police say Latanowich shot him once in the head, killing him.

Nero was also shot in the head, but survived and has been recovering well.

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According to recent court documents, the apparent confession shows Latanowich admitted to killing Sgt. Gannon, just moments after he pulled the trigger.

Immediately after he pulled the trigger on Sgt. Gannon and his partner Nero, Latanowich called his ex-girlfriend, leaving her a voicemail message that said "I shot a cop, I killed a cop."

This never before seen State Police investigative report says Latanowich's ex-girlfriend reportedly responded to find out what kind of trouble he was in and encouraged him to "do the right thing."

State Police say Latanowich then sent a flurry of text messages to the woman, beginning at 3:40 p.m. on April 12, saying "I'm taking as many as I can," "I already shot him," "I killed a cop" and "I shot a K-9."

Investigators say the exchange happened while Latanowich was held up in the attic of a home in Blueberry Lane in Marstons Mills, where Sgt. Gannon and other officers were trying to serve Latanowich with an arrest warrant.

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Sgt. Gannon and Nero were both shot after they discovered Latanowich hiding behind insulation, prompting an hours-long stand-off that eventually ended when Latanowich called 911 and asked to speak with his ex-girlfriend. Police say she came to the scene, and helped convince him to surrender.

Latanowich remains held without bail and is facing charges for murdering Sgt. Gannon and mistreating a police dog.

Nero continues to recover but is not expected to return to the police force.

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