Whitney Houston's body arrives home in New Jersey

Whitney Houston's body arrived in her home state of New Jersey, ahead of a funeral expected later this week for the pop superstar whose blockbuster career was often overshadowed by drug and alcohol abuse.

A plane owned by actor-producer Tyler Perry landed at an airport in Teterboro, New Jersey, where security was tight. A gold hearse left the airport and arrived just before midnight at the Whigham funeral home in Newark, the city where Houston was born. A crowd of about 50 fans had gathered outside.

A spokeswoman for Houston's family said plans for a memorial had not yet been completed, but media reports have said a public viewing and funeral would be held later this week.

Houston, 48, rose from singing in a church choir to become one of the best-selling and most admired performers of her generation.

She won six Grammys and more than 400 other awards in a 25-year career that also saw her star in such blockbuster films as "The Bodyguard." She was best known for her 1992 hit single "I Will Always Love You."

But Houston's success was eclipsed later in life by problems with drinking and drugs. She had a long history of addiction to alcohol, cocaine and marijuana, admitting so on television talk shows. She was in rehab as recently as May 2011.

Houston died in a Beverly Hills hotel room Saturday on the eve of the music industry's Grammy Awards, and because of her drug battles, speculation arose that she might have died of a drug overdose.

Yesterday, Beverly Hills police called a news conference to address the media "rumors," but did not add much additional information. They did say the singer's body had been found underwater in the hotel room's bathtub.

"Ms. Houston was apparently discovered in the bathtub by a member of her personal staff," who called hotel security, Beverly Hills Police Lieutenant Mark Rosen said. She was pulled from the bathtub, but when paramedics arrived "she was unconscious and unresponsive," he said.

Rosen declined comment on whether prescription drugs were in the room or the condition of Houston's body. Detectives have sealed their inquiry, he said.

"We are not conducting a homicide investigation at this time. We do not know the cause of death, we do not know the circumstances leading up to her death," Rosen said.

An autopsy was completed on Sunday, and a final death report is pending completion of an official investigation and toxicology reports that may take weeks to finalize.

Los Angeles assistant chief coroner Ed Winter said prescription medication was found in Houston's room, but he declined to detail the names of the drugs or the amount found.

Meanwhile, Houston's brother-in-law, Billy Watson, told ABCNews.com yesterday that he doesn't believe the singer would have taken her own life.

"Oh, no, this is accidental," he said. "She wouldn't have left her daughter like that. She wouldn't have done that to her daughter."

Houston's daughter, Bobbi Kristina Brown, 18, was in Los Angeles when her mother died.

Houston had been in Los Angeles for the Grammys and planned to attend an annual pre-award party hosted by record producer Clive Davis on the night she died.