Brian Lee Gomez, 28 and a resident of Long Beach, California, was shot and killed on September 28, 2015, in Montebello. He had gone to the 1600 block of Neil Armstrong Street to sell a gold necklace to a man he met on OfferUp. Video shows the buyer, identified as Sean Matthew Garcia, produce an assault rifle, chase Gomez and fire at his feet during what investigators described as a robbery attempt. As Gomez reached into his pocket where he held the necklace, Garcia shot him; Gomez was pronounced dead at the scene and the necklace was left behind.

Investigators say Garcia had used OfferUp to target others and that evidence recovered at his home linked him to a previously unreported robbery involving an assault rifle. Garcia was charged with murder with a special circumstance of committing the killing during an attempted robbery and using a rifle to inflict harm; he was also charged with robbery related to the rifle. He was being held in Los Angeles County Jail on $2 million bail and was scheduled for arraignment on October 22, 2015. The Montebello Police Department continued to seek additional possible victims.

Did anyone who met buyers or sellers through OfferUp in the Montebello area in fall 2015 notice suspicious activity or encounters that could help investigators?