Andreas Bruhn
Andreas Bruhn played guitars and wrote part of the music for The Sisters Of Mercy's third studio album Vision Thing.
He continued as live guitarist with The Sisters until the end of the 1993 tours.
There is an interview with him here, (courtesy of those nice folk at myheartland.co.uk)
For those interested further, see this two-part interview with Andrew Eldritch and Andreas Bruhn by MTV in 1990 at the Fishmarket in Hamburg here (Pt. 1) and here (Pt. 2).
Andreas Bruhn left The Sisters of Mercy in 1993 to bring forward his own band project Broon, which he was offered a chance to present this to the public at Rock Am See Festival Losheim in September 1993. But he didn't take the chance for reasons unknown.
For his most recent biography/discography see Andreas Bruhn @discogs and of course Andreas Bruhn.com.