Delvecchio Patrick's murder trial began in Dallas on May 18, 2015. He is charged with killing Deanna Cook.

Deanna Cook trial: History of abuse is focus of day 3

The third day of testimony in the Deanna Cook murder trial is focusing on the history of abuse between her and her ex-husband.

DALLAS -- The third day of testimony in the Deanna Cook murder trial is focusing on the history of abuse between her and her ex-husband.

A Balch Springs police officer testified Wednesday about a 2009 assault in which defendant Delvecchio Patrick broke down a door and strangled Deanna Cook, while threatening her with a knife.

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A witness to the 2009 attack says Patrick was angry because Cook wasn't answering her phone.

A neighbor later testified about a 2010 incident where Cook pounded on her door in her bra and underwear, saying "He's trying to get me - open the door!"

Cook was charged with aggravated assault with a deadly weapon for stabbing Patrick in that attack. The case went to trial but Cook was found Not Guilty.

Patrick is accused of choking and drowning his ex-wife while she was on the phone with 911 in August 2012.

Defense attorneys are trying to show that Cook was aggressive and often instigated fights between the couple.