HAYWARD -- A nonprofit organization and the family of a Hayward man found shot to death in an abandoned auto repair shop last year are now offering a $3,000 reward leading to the arrest and conviction of the person or persons responsible for the killing.

The family of Luis Ernesto "Neto" Calleros and South County Family Services of Hayward are doing everything they can to keep the case in the public eye, said Amy Rickard, spokeswoman for the organization.

As of late last year, the nonprofit organization and family had been offering a $2,000 reward.

Calleros, 19, was last seen Oct. 22, leaving a home near Folsom and Pompano avenues in south Hayward, police said. His father reported him missing Nov. 1.

His body was discovered on Nov. 7, in the abandoned Perry and Key Auto Repair Shop on Mission Boulevard in Hayward, police said. Authorities have not released a cause of death but are treating the case as a homicide.

On Tuesday, Sgt. Eric Krimm confirmed the homicide remained under investigation.

A public candlelight vigil and rosary were held at the on Nov. 11 at the auto repair shop. A private memorial service was held on Dec. 1.

Anyone with information about Calleros' death or disappearance can call police at 510-293-7000 or submit an anonymous tip at 510-293-7197.

Contact Natalie Neysa Alund at 510-293-2469. Follow her at Twitter.com/nataliealund.