Mike Tyson flew back to Phoenix when he heard of the accident
The four-year-old daughter of US boxer Mike Tyson has died, a day after she was injured while playing at home, police in Phoenix have said.
Exodus Tyson had been in hospital on life support since Monday, when she was found with her neck caught in a cable of a treadmill exercise machine.
Mr Tyson, an ex-heavyweight champion, was in Las Vegas when it happened, but flew to Phoenix on Monday.
A police investigation has ruled the death a "tragic accident".
"I was just advised by investigators that Exodus Tyson was pronounced deceased at 1145 [local time on Tuesday - 1845 GMT] at the hospital," Phoenix police spokesman Andy Hill said in a statement. "Our sympathies go out to the family."
Police had earlier said the girl was playing on the treadmill on Monday when her head apparently slipped inside a cord hanging under the console.
They said the girl had either put her head in the looped cord or slipped and was unable to remove it.
She was found by her older brother at the family's home in Arizona.
The child's mother had called emergency services when she was alerted by her son and tried to resuscitate her.
The family has asked for privacy.