A post mortem on David Hockney's assistant and friend Dominic Elliott has shown "no obvious natural causes for his death," Humberside Police has said.
Further tests will now be carried out, but their results will take some weeks.
More top news
Teams searching for the missing RAF serviceman Corrie McKeague have admitted they're running out of logical places to look for him.
Misty low cloud and some patchy fog again tonight but with mild air, temperatures where you'd expect by day rather than by night
Lincoln City and Millwall have learned their FA Cup quarter-final fate after their giantkilling antics.