Mr Letherby died on 17 April following an attack outside the De Winton pub, Tonypandy.
Three people, Jamie Leyshon, 26, Dean Doggett. 26 and Kylie Thomas, 25, have been charged with his murder.
Nathan Gould and family friend Kelly Thomas have set to ease the stress on the grieving family by setting up a fundraising page to help contribute towards Wayne’s funeral.
Nathan Gould, 16 from Tonyrefail, said: “We have set up the fundraising page to raise money for his amazing wife, Linda, to support her with all the funeral costs.
“We are working with all the family to ensure you every single penny that is being donated will go to them. Wayne was a loving husband, father and grandfather. He was a hard-working man who loved all of his family.”
Those wishing to donate can visit: http://bit.ly/FuneralFundraiser