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A $30,000 reward was announced Monday in the unsolved shooting death of Calvin Gray, a Los Angeles County Sheriff’s Department security officer who was gunned down in July in front of his young son.

The shooting occurred around 8 p.m. on July 29 as Gray was dropping his son off at the home of the boy's mother in the 1000 block of West 76th Street in South Los Angeles.

Just as his son stepped out of the car, someone in another vehicle pulled up alongside Gray and opened fire, killing the 33-year-old father, according to a news release from the Sheriff's Department.

Investigators held a news conference on Monday, hoping a reward might provide the break they need to solve the case.

"We definitely need the help of the public to come forward (and) provide information," said Detective Tim Marcia of the Los Angeles Police Department. "Calvin Jr. is here, left without a father. This family lost a son, a brother and we need help."

The Professional Peace Officers Association was offering a $20,000 reward, while the County Board of Supervisors offered an additional $10,000 reward.

Gray worked for the Sheriff’s Department for four years.

His first assignment was providing security at the Maravilla Senior Center in the City of Los Angeles, according to the release.

He worked at the Center for about two years, before being assigned to Harbor-UCLA Medical Center.

Gray left behind four children and a very large family including his parents, four sisters and twelve brothers.

"If anyone knows anything about solving my child's death, please go to the authorities," said Margaret Gray, mother.

Anyone with information was urged to contact LAPD Robbery Homicide Division at 213-486-6890.