He moved to New York City around 1920 to further his musical studies, and likely adopted the McMoon spelling around that time.
He was diagnosed with pancreatic cancer and moved back to San Antonio, dying two days after arriving.
His remains were cremated and his ashes rest at Sunset Memorial Park in San Antonio.
[4][7] McMoon was portrayed by actor Donald Corren in Souvenir, a play about Florence Foster Jenkins' career, which ran on Broadway in 2005 and has since been staged in many regional theaters.
Helberg received a Golden Globe nomination for Best Supporting Actor for the role.