In it, Mr Hutch said he was worried about his flat being exposed
The latest victim of Dublin's gangland feud had appealed for help just 24 hours before he was killed.
Gareth Hutch was gunned down in Dublin's north inner-city at around 10.00am this morning.
But in a letter seen by Newstalk.com, Mr Hutch had written to his social welfare officer over fears about his personal safety.
He also said he may need to be moved from his residence.
"You should be aware of the background issues surrounding my family and I have been advised by the Gardai about my personal safety. Indeed, the house number is with the Emergency Response Unit in case of any incident", he wrote in the letter addressed to Dublin City Council.
"I live on the first floor in the complex and there is a back balcony which is accessible from ground floor level and is also at a point in the complex which is not covered by CCTV".
"The fact that this black spot gives unrestricted access to my balcony is a cause of concern to me".
"The ideal situation would be that I can stay within the complex as I have many good friends and neighbours there...I understand that there may be some vacancies coming up in the complex and the flats involved are much safer".
"I am on the transfer list and getting a priority would obviously speed up the transfer process".
Local councillor Nial Ring says he helped Mr Hutch compose the letter yesterday, and that he was going to deliver it to Dublin City Council offices today.