ATLANTA - R&B singer Bobby Brown on Monday mourned his daughter, Bobbi Kristina Brown, who died Sunday at age 22, nearly six months after being found facedown and unresponsive in her bathtub.

"Krissy was and is an angel," Brown, 46, said in a statement to Newsday via his attorney, Christopher Brown. "I am completely numb at this time. My family must find a way to live with her in spirit and honor her memory. Our loss is unimaginable. We thank everyone for the prayers for Krissy and our family as we mourn my baby girl."

Bobbi Kristina Brown's mother was the late pop star Whitney Houston. On Sunday, the Houston family announced Brown had died at Peachtree Christian Hospice in Duluth, Georgia.

"Entertainment Tonight" said Monday that the time of death was 8:17 p.m., and that filmmaker and playwright Tyler Perry, a family friend, was helping arrange the funeral, tentatively set for Thursday in the Atlanta area. She will be buried at Fairview Cemetery in Westfield, New Jersey, next to her mother, according to "ET."

An initial autopsy "does not show an obvious underlying cause of death and no significant injuries were noted," the Fulton County Medical Examiner said in a statement Monday. "No previously unknown medical conditions that could have contributed to death were identified."

No death certificate would be issued or a cause of death stated until additional laboratory tests are complete "and all investigative, medical, and other documentary records are received and thoroughly reviewed," the statement said. These processes should take several weeks, the medical examiner's office said.

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Bobbi Kristina Brown's boyfriend, Nick Gordon -- who with another person discovered her in an unresponsive state at her town house in suburban Atlanta on Jan. 31 -- was "distraught" at her death, his friend Jack Walker told CNN Monday. "Even though [she] was in that condition, [he] always had hope that she would pull through. He was saying for the last week or so, 'I love her. I don't want to lose her. I just want to see her,' " Walker said, adding, "All he wanted to do was see her, hold her hand, talk to her. He was not allowed to do that."

On June 24, Brown's conservator sued Gordon alleging he had caused "substantial bodily harm to Brown" and stolen more than $11,000 from the comatose woman's accounts.