Someone who knew Lee Halpin has left this tribute to him on a Facebook page for a film organisation that he was associated with:
Lee Halpin has passed away during a fearless conception of a documentary he hoped would be seen by thousands of people and make an impact raising awareness about homelessness.
Sleeping rough for one week with no holds barred, he was chasing a dramatic narrative, a rebirth as a human and film that would make a difference.
With a BANG and a strong seed planted he has departed and I will do everything I can to finish this film and make the mark he hoped to leave.
More top news
More than 80 prominent Britons, including Boris Johnson, Russell Brand and former Government ministers, urge Obama to release Aamer.
Thundery overnight with a Met Office warning for rain in place for a large swathe of the country. Quite sunny throughout tomorrow.
Video shot in Islamic State capital Raqq purportedly shows at least two of three missing London schoolgirls.