A California boy was stabbed to death after being confronted by a group of teens at a Chick-fil-A restaurant, leaving his family heartbroken, KTLA-TV reports. Around 5:40 p.m. Wednesday, the teens allegedly confronted 13-year-old Marco Murillo at the fast-food restaurant near 7th and Flower streets in downtown Los Angeles. The teens then chased Murillo about a half-block …