BORDEAUX, July 25 -- A notorious French singer who beat his girlfriend to death is to face a new legal investigation over the suicide of his ex-wife following a Netflix documentary about his violent behaviour, prosecutors said Thursday.

Bertrand Cantat, former singer with popular 1980s rock band Noir Desir ("Black Desire"), was the subject of a widely watched three-part Netflix documentary that aired from March this year.

He was sentenced to prison over the killing of actress Marie Trintignant in a Vilnius hotel room in 2003, but worked and performed after being released despite protests and calls for a boycott.

Prosecutors in Cantat's hometown Bordeaux said in a statement Thursday they were looking into "potential acts of intentional ...