Signed to Heavenly Recordings, Flowered Up became notorious as the "Cockney Happy Mondays" during the baggy era when their 13-minute track Weekender hit the Top 20 and became a post-acid house anthem.
"This is very sad news, a real shame," says Heavenly founder Jeff Barrett. "Liam and Flowered Up burned beautifully and brightly at exactly the right time. They had their moment and seized it by the bollocks."
Maher formed Flowered Up with friends including Tim Dorney, who went on to become the driving force in Republica.
As well as two other singles for Heavenly, Flowered Up recorded the album The Life Of Brian for London Records in 1991.
After the band split in 1993, Maher battled with drug problems. He was signed to Alan McGee's label Poptones in 2001 but no material was released.