It's official. Sonny Bill Williams is a Chief for the 2012 Super Rugby Season.

The All Blacks superstar has confirmed that he has re signed with the New Zealand Rugby Union for one more year, and will play with the Chiefs franchise.

Specific details of Williams' contract are confidential, however he retains the option to take part in a limited number of professional boxing fixtures.

Story by: William Waqavakatoga
Source: Stuff.co.nz