Earlier this month, 8-year-old Lelia Fowler of Valley Springs, California was found stabbed to death in her home. She was left in the care of her 12-year-old brother while her parents were at a little league game.

The brother told police that he found Lelia stabbed, and saw an intruder fleeing from the house. The boy’s story kicked off a massive door-to-door manhunt that turned up no leads. The 12-year old was arrested weeks later for the murder of his sister.

According to a report from CBS News in Sacramento, the boy, identified as Isaiah Fowler, yesterday pleaded not guilty to a charge of second-degree murder. His attorneys have stated that the boy may have lied about seeing someone flee from the house, but that there is no clear evidence he stabbed his sister.

Isaiah Fowler is currently being held in a juvenile detention center.