The brother of heavyweight boxer Joseph Parker has been released after being detained in Chicago following an alleged assault at O'Hare International Airport.
It is understood John Parker, a former professional boxer, allegedly attacked at least one member of the public after he was removed from a Chicago to Los Angeles flight due to a ticketing issue.
He was in transit returning from his brother's victory against Alex Leapai on Sunday in Providence, Rhode Island.
It is believed the 25-year-old has since been released by police to family members but it remains unclear whether he faces any charges.
He was also involved in an alleged violent incident at his hotel the previous night.
On that occasion, he attacked a member of Joseph's extended management team, not David Higgins, who required hospital treatment.
Higgins said it was a tragic situation.
"I am aware of an incident involving John," Higgins said. "I wasn't present at the time so I don't fully know the details and am relying on what I've been told by third parties.
"But I understand there has been an assault but do not wish to comment further until the facts are clear.
"It's become apparent that John has been dealing with some mental health issues that seem to have contributed to the issue. Obviously I sympathise with those involved and we're looking to provide all the support we can."
Joseph, himself on his way back to New Zealand, was asleep and did not notice his brother had been removed from the flight. He said he was personally devastated and asked for his and his family's privacy at this time.
"I can confirm that my brother John has been detained in the United States following an incident that occurred on his way home to New Zealand.
"I can't comment on the details of this matter – other than to say that the Parker family's prayers are with John and anyone who has been affected.
"This is an extremely difficult and upsetting situation for our family, and we humbly request privacy at this time."
John fought the last of three professional bouts in May 2017. He was undefeated but was forced to retire after being diagnosed with a brain bleed last year.
Dylan Cleaver traveled to the US courtesy of Duco