Troy Kevin Taylor, 23, had denied murdering the 14-month-old boy during a two-week trial at the High Court in Christchurch.
He claimed that his then-partner and Ihaka's mother Mikala Stokes inflicted the boy's 59 fatal injuries on July 3, 2015 while he was out getting a tattoo.
But after four hours of deliberations, a jury of six women and six men were unanimous in finding Taylor guilty of murder.
The mother of murdered Christchurch infant Ihaka Stokes went nightclubbing last night just hours after her ex-partner was found guilty of the boy's brutal killing.
Mikala Stokes, 21, posted a photo on social media in the early hours of this morning.
The selfie caption read: "From court to club".
Earlier in the evening, after Troy Taylor, the man who blamed her for killing her 14-month-old son at their Christchurch home in July 2015, was found guilty, Stokes posted photographs of her playing beer pong.
Troy Kevin Taylor appearing in the Christchurch High Court. Photo / Pool
She told the jury how she saw 23-year-old Taylor earlier on the day Ihaka died.
Mikala Stokes sent this message to social media.
Taylor claimed that Stokes inflicted the boy's 59 fatal injuries on July 3, 2015 while he was out getting a tattoo.
Stechmann said Taylor appeared "happy, normal" that day.
He had talked of plans to go away for a weekend and how they'd taken Ihaka to see a doctor that morning after finding bruising on his jaw.
When he left after getting the new tattoo, he seemed "perfectly normal, just Troy", Stechmann said.
Stechmann saw Stokes, Taylor and some other friends in a shopping mall just two days after Ihaka died.
"Troy was telling me what happened, because I hadn't realised, and Troy started crying, the others started crying, and [Stokes] was just standing there emotionless. That has always stuck with me," she said.
"From the start, I thought her behaviour was extremely strange. And again last night it was extremely strange."
Stechmann also questioned some of her social media posts during the trial.
She posted photos of her and Taylor, along with messages of: "I will always love you".
After eight days of evidence, the jury deliberated for just four hours to find Taylor guilty of murder and assaulting the small boy the day before he died.
Taylor mouthed "no" as the verdicts were read out, while family members in the packed public gallery gasped, "no way".
