Three woman were killed after a horrible jet ski accident in Los Angeles County when the jet ski's they were riding collided with a boat on the lake. The fatal jet ski accident occurred on Puddingstone Lake in San Dimas California. The cause of the fatal Jet Ski accident is still under investigation by Los Angeles Authorities. The names of the 3 woman are not being released so that their next of kin can be notified. In addition, four people on the boat were also injured in the jet ski accident.