“There isn’t a day that goes by that I don’t miss her and I don’t wish to hold her again. Rest in peace my little one XXX @nathanielcomer.”
Keavy rose to fame in the late 1990s with B*Witched, alongside twin Edele Lynch, Lindsay Armaou and Sinéad O’Carroll.
The band released the likes of best-selling singles Rollercoaster, To You I Belong and Blame It on the Weatherman.
Her sister, 40, who was married to fitness instructor ex Michael Barrett for seven years, has three children.