It was on Channel 5's The Wright Stuff yesterday morning that it's being speculated by Steve Allen that he took his own life. Steve Allen claims that he was a close friend and that Dale rang him to ask if he wondered if anyone would turn up for his funeral.
This article says that he was suffering from depression and had to sell his home to cover mounting debts:
https://www.pinknews.co.uk/2018/04/2...s-london-home/
Either way it's very, very sad.