Lukasz Czapla denies murdering two-year-old Julius in Muirhouse, Edinburgh, in November 2020.
His lawyers have lodged a special defence which states he should be acquitted of murder because he had diminished responsibility at the time of Julius' death.
Urging jurors to convict him of murder, Mr Cameron made reference to evidence from consultant forensic psychiatrist Dr Alex Quinn who told the court he believed that Mr Czapla's actions were a "narcissistic and entitled" act. "Against a background of obsession about his ex-partner's supposed infidelity and made furious by her mention of a new partner and refusal to discuss him or her sex life with him, the accused voluntarily consumed alcohol and drugs.
"That he may deeply regret it now is of no moment," Mr Cameron added. "All that matters is that he did it."
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