He called 911 and performed CPR until public safety officers arrived and took over, said police spokeswoman Lisa Holland.
Brown was taken to a local hospital, where “she is still alive and breathing. Other than that, I don’t know her condition,” Holland said Saturday.
Nobody knows what caused Brown’s unresponsiveness, Holland said, but police consider it a medical incident at this time. She said investigators had found nothing to indicate it was drug- or alcohol-related.
Police had been to the residence recently. Somebody reported a fight there January 23, but nobody answered the door and officers found no evidence of an altercation, Holland said.
The police spokeswoman noted one oddity in the case: “Her mother died in the very same manner.”
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Concern for Brown surged again after news broke.
Music director Michael Bearden sent along “healing energy to the daughter of a late great friend.” Songwriter Diane Warren tweeted, “I hope Bobbi Kristina gets the help she needs.”
“Poor thing,” Warren wrote. “Almost 3 yrs to the day her mom passed and the same thing almost happened to her.”
CNN’s Lisa Respers France and Nick Valencia contributed to this report.