[Grislygus]

Ignoramuses aside, the artist in question was Walter Sickert. There was a theory that he was an accomplice in the 70s, and a more recent book claims that he was Jack the Ripper himself.

The newer book largely relies on melodrama and sketchy dna 'evidence'. Haven't found any info about ties between individual paintings and the murders, though, which is something that I specifically remember reading about.