Jona Weinhofen formed metalcore band I Killed the Prom Queen in Adelaide, alongside drummer JJ Peters in 2000. The band released two LPs, one EP, a split EP, a demo and a live CD/DVD before splitting in 2007, with Weinhofen acting as manager from 2004 to 2007.
After the departure of vocalist Ed Butcher from I Killed the Prom Queen, he was invited to join American band Bleeding Through after the departure of Scott Danough and played on their release Declaration and can be seen in their videos for "Death Anxiety" and "Germany". His new spot in Bleeding Through was one of several factors that caused the split of I Killed the Prom Queen in 2007. They briefly reunited in 2008 for their "Say Goodbye" farewell Tour. Weinhofen left Bleeding Through midway through 2009 partly due to homesickness and discontent with living in America.