United Kingdom, March 8 -- Machine Gun Kelly says the birth of his second child will be "bittersweet", following the death of one of his best friends.

MGK, 34, has been left devastated by the untimely death of his longtime friend, Australian snowboarder Luke 'The Dingo' Trembath, 38, whose cause of death has not yet been disclosed, and shared his sadness that his "brother" won't be around to meet his new child, with former fiancee Megan Fox.

He wrote on Instagram: "Crazy.i didn't even cry this hard when my dad died. I've lost a lot of friends, but I've never lost a brother. We'll never get another Dingo on this planet. A true rockstar without ever needing to make a song, the most loyal, loud, charismatic, funny, and annoying human I've ...