Horne, 34, a resident of Redondo Beach, and another agent in a small boat of persecution, were thrown into the water after apparently deliberate impact of the boat that was carrying marijuana, the Coast Guard reported.
Another Coast Guard officer was also injured in the impact, although his injuries are not serious, according to police reports.
The incident happened early Sunday when the Coast Guard investigated the panga, the Coast Guard reported that the boat said they chased and arrested two people who were presented in court.
The drug trafficking by sea and has rebounded in recent years. The number of immigrants and drug traffickers arrested at sea or along the coast doubled between 2009 and 2010 by passing 867.
Horne was a veteran agent with 14 years old and died from a severe blow to the skull in the incident that occurred about two kilometers from the island of Santa Cruz.