SAN FRANCISCO (KGO) -- The 14-year-old accused of murdering a former classmate last week made his first court appearance Monday in juvenile court.Authorities say he stabbed 14-year-old Rashawn Williams, a freshman at Sacred Heart Cathedral Preparatory in San Francisco.It happened as Williams walked out of a convenience store in the city's Mission District.Police are investigating if the deadly confrontation rose out of a social media dispute.The two boys were former classmates at Horace Mann Middle School.That school has begun collecting monetary donations for the Williams family."We're also coordinating and organizing parents to make sure that they are delivering food to the family, whether it is a hot meal or groceries," said Anabel Ibanez with Horace Mann.The middle school held a community vigil for Williams on Monday morning.There is another vigil Tuesday at 4:30 p.m. at the site of the murder.