Police say the 28-year-old man was found collapsed at an address in York on Friday evening.
Joan Lawrence makes a fresh appeal for information 17 years since her daughter disappeared.
The man was discovered unconscious as crews were tackling the fire in York, North Yorkshire Police says.
Glen Gardens community kiosk is set to reopen on Saturday after it was recently targeted by vandals.
Many structures in Heworth were torched by vandals, with the site now targeted more than 100 times.
A councillor says he could not emphasise enough "how bad" the proposal for the site near York was.
Greg Marshall, 35, died from multiple stabs wounds to his neck, chest and abdomen on 17 August.
The houses would be built east of Heworth, about a mile from York city centre, developers say.
Chris Kendall says he wants to raise awareness of mental health conditions as well as raising money.
