The death of a new father who was out celebrating the birth of his son when he was fatally injured is not being treated as murder, Cleveland Police said.
Detective Superintendent Rob Donaghy told a press conference that a post-mortem examination of Benji Bolsenbroek proved inconclusive and further tests will be needed.
He told reporters that CCTV images of the "large-scale fight" inside a pub were clear and that police expect to make arrests soon.
"Benji's death is being treated as unexplained," the Cleveland Police officer said. "This is a complex inquiry with many strands to it. I'm aware there is a lot of speculation and rumour."
For more on this story visit ITV News Tyne Tees' website
The girlfriend of a man killed while celebrating his son's birth has described him as the best dad ever who had so much more to give.
Georgina McGuire took to Facebook last night to post a tribute to Benji Bolsenbroek.
Ms McGuire says she hopes she will soon wake up from the worst nightmare of her life
Police investigating the death of a father who died while celebrating the birth of his son will hold a press conference later.
Benji Bolsenbroek, 23, is believed to have died after an altercation outside the Park Hotel, on Linthorpe Road, in Middlesbrough in the early hours of Sunday.
Mr Bolsenbroek, whose son Kianey was born less than a week ago, was celebrating with six or seven friends.
Earlier he had posted on his facebook page that he was looking forward to wetting his son's head.