Police have interviewed a doctor who was the last person to treat Prince before he died.

In the month before the singer passed away, Dr. Michael Todd Schulenberg treated Prince twice, once on April 7, and then again on April 20. Dr Schulenberg flew to Atlanta on April 7 to examine Prince. The singer was forced to cancel a concert appearance that night.

As reported by the police's search warrant, he prescribed Prince with medication - though it does not specify what drugs were administered. He told law enforcement officers that he was delivering test results to the musician's Minneapolis residence, when he stumbled upon the deceased body.

Police sources claim that they are investigating whether the prescribed drugs had any part to play in an apparent overdose. The cause of death is still to be revealed.