Luke James Munday, 26, appeared in Picton Local Court today and pleaded guilty to the December assault which was streamed for the world to see from his Twitch account as he played Fortnite at their Oran Park home.
Munday stared straight ahead in court today, letting his lawyer Steven Mercael do the talking.
Dressed in a navy blue suit, a white button-down shirt and a fresh haircut, Munday sat on the opposite side of the courtroom from his partner.
The 21-year-old woman sat with a court support officer as the couple of five years avoided each other's gaze.
Munday's partner is also due in court later this week, charged with throwing a kettle at the 26-year-old gamer's head earlier this month.
According to court documents seen by news.com.au, Munday immediately admitted to smacking his partner when police arrived at their Oran Park home on December 10.
In police body-worn vision, Munday told the arresting officers, "Yes I did slap her in the face".
Munday was taken to Narellan Police Station where he again admitted to the slap.
"She went to grab my stuff and I got angry," Munday told police, according to court documents.
"I stood up and slapped her on the cheek and I grabbed her and I thought I put her on the couch but it must have been the floor.
"I held her down because I wanted her to stop."
As Munday pinned his partner to the ground, she pulled his hair and he rolled off her.
"The defendant held her down and didn't let her up … he kept pushing her down. She didn't know what going to happen next so she began to pull his hair in an attempt to get him off her," police allege.
Documents state Munday then grabbed a picture frame off the wall and threw it down the hallway.
Court documents described the incident between the pair, which started when Munday's pregnant partner threw a cardboard box at him because he refused to stop playing his Fortnite game and have dinner with the family.
Munday also made a statement to police in February, begging for the court to let him and his partner be together again. Their third child arrived a month later.
"After the incident in December 2018, myself and (redacted) have identified some key areas which require work within our relationship," Munday wrote in his February 28 letter.
Munday said he and his partner were in fortnightly counseling with Baptist Care.
The 26-year-old also addressed his partner's diagnosis of placenta previa.
"I need to support my partner and children through these hard times to ensure our boy and girls are safe and have the support they require," Munday wrote.
The couple's oldest child, a three-year-old girl, was also diagnosed with autism earlier this year.
"The ongoing relationship with (my daughter) and myself is crucial to her support as our bond is unbreakable and (she) behaves better when we are together," he wrote.
"We have been working constantly since December and we want the best for our children and strive daily to address any red flags that we or Baptist Care identify. We are positive things can only go up from here.
"We look at our situation and continue to find positives and ways to improve our lives. Our time apart has brought us closer than ever and want more than anything to welcome our little boy to the world with all the support he, (my partner) and the girls require."
An AVO was taken out against Munday today, prohibiting the 26-year-old from contacting or seeing his partner for the next two years.
Munday will be sentenced on August 26 after pleading guilty.