I think 2 of these were tragic lives, rather than tragic deaths, and drug-OD's ending their lives wasn't a shock for most, only Roy Orbison was a shock, because he had just committed himself to being healthier, and back on the road.
All of their deaths were tragic but I think I was more shocked when Roy Orbison died. He was 52 years of age and died of a heart attack.
All three of these people were great singers and great entertainers, they will be missed and remembered.
I've never heard of Roy Orbison. I have heard of Michael Jackson and Whitney Houston. Both of their deaths were very tragic, but in my opinion, I think Whitney's death was the most tragic of all of those three.