A South Australian man who was affected by drugs and hadn't slept in two days when he fatally stabbed another man has been jailed for nine years.
Jordan Robin Gene Graham, 25, pleaded guilty to the manslaughter of 35-year-old Kevin Taylor at Whyalla in April 2017.
In sentencing on Wednesday, Justice Malcolm Blue said Graham became angry after he visited the home of his "on-again, off-again" partner in the early hours of the morning.
Mr Taylor had arrived at the house a few minutes earlier, and Graham suspected "something might be going on" between the pair.
"You started a fight, in the course of which you punched Mr Taylor in the head and you both swung punches at each other," Justice Blue said.
"You grabbed a knife and returned to the fight in the lounge room.
"You deliberately stabbed Mr Taylor intending to stab him in the shoulder, but in fact you stabbed him in the chest."
Graham left the house angry, while an ambulance was called but Mr Taylor died at the scene.
Justice Blue said Graham intended to wound Mr Taylor, but did not mean to kill him or cause him grievous bodily harm.
He said Mr Taylor's family had spoken of "hurt, loss, anger, bewilderment and grief" following his death, and his mother described "a nightmare that she cannot wake up from".
An expert who assessed Graham said his social judgement was impaired on the night he killed Mr Taylor because he had consumed cannabis and alcohol.
He had also been awake for two days as a result of using methylamphetamine.
Justice Blue on Wednesday jailed Graham for nine years, with a non-parole period of seven years, two months. He will be eligible for parole in 2024.