The news was confirmed by his mother Maricar on her Facebook status.
Meanwhile, Sebastian's Jamich partner, Michelle Liggayu, said “no words can explain” how sad she feels over the passing of her fiance.
Ang sakit marinig na napag uusapan na kung anong susuotin nia. Sabay sabay tayong mag pray for Jam na mafeel love and comfort sa arms ni God
— JAMICH (@ilovejamich) March 4, 2015
"We love you, Jam Fernando Sebastian. I'm sure magiging sobrang ganda and happy ng birthday celebration mo sa Heaven. Sana ma-dream kita na ipaalam mo lang sa amin na masaya ka na and healthy ulit with God. Thank you for everything... No words can explain. Until we meet again," she posted on Instagram.
To all avid Jamich's fans, let not sorrow take over your hearts. Instead, watch this video to reminisce the happy moments they've been together.