Leneto Kellengbeck, 24, was found injured in Arran Way in Smith’s Wood, near Birmingham at about 11.15pm on Friday evening.
Mr Kellengbeck was later pronounced dead.
Online tributes revealed the boxer – who was due to fight on Friday – had a partner and a child.
A woman wrote: “Rest in peace Leneto, the world is a cruel place and I can’t believe this news.
“Thank you for being such a great Dad. You have a beautiful family. I am so devastated my best friend has lost the love of her life, the father to her child over knife crime it’s disgusting.
“Thoughts are with all your family and friends Len, fly high.”
In a 48 hour period in the UK, three people were killed.
Earlier on Friday afternoon father-of-three Gavin Garraway was killed in Clapham Common.
Zahir Visiter was killed on Thursday night in London.
Another tribute to Leneto said he went to church and ‘doted’ on his daughter.
They said: “He was a lovely kid.
“He doted on his daughter. He went to church every Sunday. He was a church goer and lived round here.”
“He raised a lot of money for Birmingham Children’s Hospital – he wanted to help out. He was a good person.”
Detective Inspector Michelle Allen, from West Midlands Police, said: “A man has sadly lost his life and we are working hard to establish the circumstances around what happened.
“The investigation is in its early stages, and we’re keen to hear from anyone who can help us piece together the circumstances leading up to the attack.
“If you were in Arran Way at the time, please contact us as you may have vital information about what happened.”
Thirty-two people have been killed in London this year.
This weekend, four people were stabbed in ‘random attacks’ in the capital. Two of them are in a critical condition and one has potentially ‘life-changing’ injuries.