Yes, people have died due to depressurization of commercial aircraft, as well as military. There was a famous case of a Learjet where everyone became unconscious from a depressurization and the plane kept flying until it ran out of fuel. A more recent incident, a couple of years ago in a TBM 900 where the plane flew on with the crew and passengers unconscious or dead, until they passed over Cuba and crashed near Jamaica.
In my time as an Air Force pilot I had one explosive decompression, but as I was in a fighter I already had my oxygen mask on so it was no big deal. In the B-52 we wore O2 masks during any highly critical phase of flight, low level, air refueling, landings etc. We also had to have helmet on, so mask on or hanging off our face, whenever we were above certain altitudes (can't remember now) or when one pilot left the flight deck.
I had more insidious decompression in my pressurized Cessna skymaster but that was during my air force years so I was used to always checking gauges, and I caught the problem before the cabin altitude went high enough to be dangerous.