James Mumper Jr. was sentenced in Chula Vista court Friday for the fatal stabbing of 17-year-old Mateo Alexander Castillo at a house party in November 2022.
James Mumper Jr., 19, was arrested about a month after the Nov. 12, 2022, stabbing death of Mateo Castillo, 17, a senior at Valhalla High School in Rancho San Diego
A young man was arrested in connection with the stabbing death of a 17-year-old boy at a Chula Vista house party, Chula Vista Police announced Tuesday.