A man who denies killing his former partner during a violent argument was heard wailing incomprehensibly as he tried to resuscitate her the next day.

Danny Zayat, 30, had been in a volatile relationship with 34-year-old Tatiana Dokhotaru before she was found dead in her south-west Sydney apartment on a Saturday in May 2023.

Zayat is accused of murdering her the previous night after a physically violent and verbally abusive argument heard by neighbours on the 22nd floor of the Liverpool complex.

Two phone calls the concreter made to triple zero the day after the alleged murder were played to his NSW Supreme Court jury trial today.

During the calls, he can be heard at times wailing and speaking incoherently as the operator gave directions on how to administer CPR.

"She's not breathing,

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