His brother, Greg, announced the news on Facebook on Thursday, 20 November 2025, stating Mani is now "reunited with his beautiful wife Imelda".
The cause of his death has not yet been disclosed.
Weeks before his passing, Mounfield recounted an infamous incident from 1995 where he threw his bass guitar on stage in Atlanta due to "tuning issues".
He shared this story on the 'Rockonteurs' podcast, expressing regret and stating he "never disrespected my guitar again since that day".