India, June 24 -- A California fitness celebrity with over 150,000 Instagram followers was shot dead by her estranged husband as she was out on a date at a sushi restaurant.

According to authorities, Gloria Zamora, 40, died at the Falcon Ridge Town Center parking lot in Fontana at around 9.40 p.m. on Saturday. Responding to the tragic death of their mother, one of Zamora's seven kids denounced the incident as "unimaginable act of violence."

According to investigators, suspect Thomas Lizarraga, 45, found Zamora and her date, 43-year-old father of four Hector Garduno, outside Summa Sushi. He fired gunshots at both of them.

The gunshot alerted a San Bernardino County sheriff's deputy who was among the off-duty law enforcement officers in ...