Superstar Prince is on track to take the number-one spot in both the singles and album charts.

The musician's signature 1984 anthem Purple Rain is a strong early contender for the top spot on the Official Singles Chart.

An early chart estimation shows four of the top five places in the singles chart look set to be dominated by Prince.

His classic song When Doves Cry is on track for second place behind Purple Rain, with Kiss at number four and 1999 in fifth position.

Early estimates for the album charts show that Prince's classic offerings are dominating half of the Top 10, based on a tally of 24 hours' worth of data.

Currently on course for number one is The Very Best Of, Ultimate is in second position and the official soundtrack to the movie Purple Rain in third position.

Fifth position looks set to be grabbed by The Hits/The B-Sides, with Sign O' The Times in sixth position.

The full Official Singles Chart and Albums Chart Top 100 will be published on Friday at 5.45pm at OfficialCharts.com.

Meanwhile, police are probing the death of the musician - who was born Prince Rogers Nelson in June 1958 - after authorities revealed there was “no reason to believe” it was suicide.

He was found collapsed in a lift at his Paisley Park estate near Minneapolis in the US on April 21. He was 57.

Carver County Sheriff Jim Olson said there were “no obvious signs of trauma” on Prince's body and it was “still under investigation” whether foul play was involved.

Speaking at a press conference at Carver County Courthouse in Chaska, Minnesota, Sheriff Olson refused to comment on reports that Prince had been taking a powerful painkiller before his death.

He said Prince was last seen at 8pm the night before his death when he was dropped off at Paisley Park.

He had been alone at the estate and staff members had been unable to reach him, the official added.

A post-mortem examination took place on Friday, where information about Prince's “medical and social history” was gathered, the Midwest Medical Examiner's Office said.

His body has been released to his family but a cause of death may not be made public for weeks, officials said.

A spokeswoman for the Midwest Medical Examiner's Office said it would not release information from the post-mortem examination until “all results are obtained” and the findings of a toxicology scan “could likely take weeks”.

Prince was found collapsed in a lift by staff members, Sheriff Olson said.

“There were no obvious signs of trauma on the body at all,” he said. “We have no reason to believe at this point that this was a suicide.”

Asked whether there was any reason to believe foul play was involved, Sheriff Olson said: “We have no reason to believe at this time it was a suicide, the rest of it is under investigation.”

There had been no previous calls to the county sheriff involving Prince at Paisley Park in the last year, he added.