A 13-year-old boy who died last month after he was sucker-punched by classmates had complained of bullying to an administrator at his Southern California middle school days before the alleged assault, a lawyer representing his family said on Tuesday. Dave Ring said he had filed a wrongful death claim against the Moreno Valley Unified School District on behalf of the family of Diego Stolz. The claim serves as a precursor to a wrongful death lawsuit. The filing alleges that Stolz died as a result of being bullied and asserts that the district "failed to take bullying complaints by Diego's family seriously and failed to enforce anti-bullying policies to protect its students." The filing also claims that the school district "has a long history of student altercations on its campuses."