Datisi,
Here the two of you can conspire at all times and submit your nightly kill and other actions. You should specify which of you carries out the kill (but if you don't, I will assume the player making the post is the one carrying it out).
Yes (according to the wiki entry, "[t]he Mafia Roleblocker or Mafia Rolecop can also perform the kill, which might cause a Follower to receive two results.")