A man who died after a stabbing in Leiston suffered a 13cm deep wound near his hip, which damaged a major artery, a court has heard.

Oskars Kantors, 29, of Old School Close, Leiston, denies murdering 41-year-old Agris Leigavnieks on October 17 last year, as well as an alternative charge of manslaughter. 

Consultant forensic pathologist, Benjamin Swift told a jury at Ipswich Crown Court on Tuesday, November 7, that the wound caused extensive internal bleeding, with half the volume of blood in Mr Leigavnieks' body leaking into his abdominal cavity and the space behind it.

Dr Swift said there had also been some small damage to his spleen and part of his bowel but the damage to the left common iliac artery was the most significant injury.

He said in his opinion the wound to the artery was caused by a knife with a single cutting edge and at least moderate force had been used to inflict it.

The court has heard Kantors has admitted two offences of assault causing actual bodily harm on a man and a woman on the same evening as the alleged murder.

Simon Spence KC, prosecuting, has told the court that Mr Leigavnieks had previously been in a relationship with Kantors' girlfriend and on the night of the alleged murder the defendant and his partner had an argument after he had been drinking and went out with his half-brother to buy cat food but returned with alcohol.

During the evening Kantors had also gone to a house in Leiston Court in the High Street and had repeatedly punched a man he knew in the face resulting in the police being called and the man being taken to hospital.

Kantors had then gone to a house in Old School Lane, Leiston, where a woman was bathing her baby and grabbed her by the hair before slamming her on to the floor, said Mr Spence.

Later the same evening other residents of the shared accommodation in Old School Lane where Mr Leigavnieks lived went to his room and found him in a crouched position on the floor and described him as grey and barely breathing.

Mr Spence said Kantors had allegedly admitted stabbing Mr Leigavnieks to a neighbour who said he didn't appear to be concerned about what he'd done.

Kantors also allegedly told another witness that he suspected his partner and Mr Leigavnieks of having an affair.

He allegedly said he had installed hidden cameras in his house after catching them together.

The trial continues.