Now suppose that your clone goes to the roof of a 10-story building and intends to commit suicide. As your clone falls past your window (on the 5th floor), you fire a gun, which hits him/her. However, there's a safety net below there, so the suicide attempt wouldn't have succeeded.
Now ... is THAT murder, suicide, or assisted suicide?
1) murder
2) suicide
3) assisted suicide
The answer depends on some unstated conditions:
If you knew that your clone was trying to commit suicide and you wanted to help, but your clone
didn't know that you were going to help, it's attempted suicide and assisted suicide.
If you knew that your clone was trying to commit suicide and you wanted to help, but your clone
did know that you were going to help, it's suicide and assisted suicide.
if you didn't know that your clone was trying to commit suicide, then it's attempted suicide and murder.
IMO, If you wantonly kill a sentient being, that's murder. Good luck getting everyone to agree on the definition of sentient, though.