SpaceX Rocket Explosion Likely Caused by Faulty Strut, Elon Musk Says

It seems that a steel strut holding a high pressure helium tank within the liquid oxygen tank broke due to a manufacturing flaw. The helium tank broke loose and overpressurized the LOX tank,causing it to burst.

The Dragon capsule survived to splashdown. however, it wasn’t programmed to pop its chute, so it hit the ocean at high velocity. The next Dragon capsule will have a software update that will allow it to self-recover in the event of another launch vehicle failure.