The injury occurred on July 12. Surgery is scheduled for August.
Lipford originally tore his ACL during the Independence Bowl versus Missouri on Dec. 26, 2011. He will red-shirt this fall and have two years of eligibility remaining.
The Lenoir, N.C. native started four games at linebacker in 2011 and tallied 42 tackles.
CHAPEL HILL, N.C. -- North Carolina junior linebacker Darius Lipford reinjured his left ACL during a rehab session last Thursday and will undergo reconstructive surgery that will force him to miss the 2012 season. A school official confirmed the news to InsideCarolina.com on Thursday.
The junior linebacker tore his left ACL in the Independence Bowl in December.