The 45-year-old played two Tests for Samoa and then, following a three-year stand-down, seven for the All Blacks, including against South Africa at the 1999 World Cup.
A statement released by Mika's family on Tuesday says he passed away suddenly and unexpectedly, NZME reports.
"Dylan was a very much-loved husband and father to Tracy and their daughter, Marley, and dearly loved son, brother, uncle, cousin and friend.
"He was a hugely talented athlete, well-respected in the Samoan community and abroad, but just as importantly to his friends and family a warm, wonderful and caring man.
"Gone far too soon at the age of just 45."