Joe Corre, co-founder of the Agent Provocateur lingerie label, found Luca Mainardi's body hanging at his London home on Thursday (17Sep09).
Corre, the son of former Sex Pistols manager Malcolm McLaren, was with the 48 year old the previous night as they recorded a new album as electro band Dirty Stop Out with former Clash star Mick Jones.
A source tells British tabloid The Sun, "It was a nightmare for him to stumble across the suicide of his closest friend. Naturally he is devastated.
"Joe and Luca spent their free time together hanging out and making music. Luca smoked a lot of cannabis and was very moody."
A spokesperson for the Metropolitan Police confirms the death is being treated as "non-suspicious".