Yes, he was convicted of felony murder. The specific controversy was that he was sentenced to life imprisonment, despite being 16 at the time: http://rt.com/usa/aclu-pledges-help-without-parole-225.

Although, he was re-sentenced to a 30-60 year sentence with possibility of parole after a 2012 Supreme Court case: http://www.thealpenanews.com/page/content.detail/id/624360/N.... Big victory for criminal justice reformers. :-/