Mark Lillienfeld said: "I thought at that time, as I do today, that this murder had sexual overtones to it, and that the Viagra would prove or disprove certain facts."
The detective went on to testify that Phil Spector's briefcase contained a packet with one Viagra tablet and empty spaces for two more, although he also had to admit that he had no evidence to suggest that Mr Spector had taken Viagra on the night in question.
Mark Lillienfield described how he found the scene of Lana Clarkson’s death: "There were candles lit on the fireplace. There was alcohol out in front of the fireplace, on a coffee table."
The prosecution allege that Phil Spector shot Lana Clarkson but Phil Spector's lawyers argue that she killed herself.
Phil Spector, who became world famous in the sixties for his pioneering production known as the “Wall of Sound,” could face between 15 years and life if he is found guilty.
"And the Viagra was a piece of evidence that would perhaps prove later on to be important."
Mr Spector pioneered the "Wall of Sound" recording technique in the 60s, working with stars such as The Beatles, Tina Turner and The Righteous Brothers.
If convicted, he faces between 15 years and life in prison.
