Yes. And to the families of the other two.
Second, what if the young man had a heart disease and the malice actions of these two individuals caused him to have a heart attack and die? Would that have been manslaughter?
That's called "a strawman" argument and doesn't change the situation.
Would you consider mental illness a disease? I believe many people in our Country are suffering from depression, anxiety, etc. If this young man did suffer from something like that and the actions of these two caused him to feel trapped not able to escape, did they not cause his death? The reason for them apparently taping had to be to cause him harm in some way?