Police are trying to piece together Mr Lynch's last movements
Anyone who may have information about the death of a man in a Manchester canal is being encouraged to speak to the Lesbian and Gay Foundation (LGF).
Alexander Lynch, 46, known as Jimmy, drowned in the canal near to Ducie Street and Dale Street on 3 October.
The area is sometimes used for men looking for sex with other men, and police realise some witnesses may not want to be indentified.
Detectives are urging those who want to remain anonymous to go through the LGF.
Det Supt Julian Ross, of Greater Manchester Police's major incident team, said: "We understand there may have been people in the area who may not feel comfortable talking to us about why they were there or what they saw.
"The LGF can act as an intermediary between the witnesses and the police.
"They will be able to collect information and pass it on to police, if necessary keeping the witness anonymous."
The LGF organisation, based on Princess Street, said anyone who comes forward with information would be helping the safety of Manchester's lesbian, gay and bisexual communities.
The police and the LGF said any information received would be treated sensitively.