More than £700 has been raised for the family of William Henry, 31, in just two days.
Mr Henry was found dead in the car park of an industrial estate off Moor Street, Brierley Hill, along with Brian McIntosh, 29, at 3.30pm, on September 30.
Mr Henry and Mr McIntosh, who both had children and were from the Bartley Green area of Birmingham, were the victims of the third shooting in the Black Country in three days.
On the fundraising page, Simeon Daniel says: "17 days ago many hearts were shattered by the sudden loss of William Henry and his best friend Brian Macintosh.
"Will was happy, full of life and had been working hard on his dreams. They created a home together and was setting up his future with his girlfriend, his step son, and their unborn child due to be born in a few months' time.
"Will was a caring, loving person, who always put his family and friends before himself.
"Nobody had a bad word to say about him. Always positive, smiling and cheerful.
"All proceeds will go to supporting the little family they were just beginning to create.
"You will be missed forever. Rest In Peace x."
A post mortem examination has confirmed both men died from gunshot wounds.
They were in a Range Rover at the Albion Works industrial estate when they were killed.
Mr Henry is the brother of West End Star Matt Henry MBE, who has appeared in West End shows including Saturday Night Fever and Kinky Boots. He also reached the final of TV talent show The Voice in 2013.
Alleged gunman Jonathan Houseman, 32, from Stourbridge, has appeared in court accused of murdering the pair.
A second person arrested on suspicion of assisting an offender has been released without charge.
To donate, visit gofundme.com/f/in-loving-memory-of-william-henry