Renata seems to suspect Pinman, though she didn't say why. I trust Renata's judgment, but I don't want to vote for someone without having a decent reason...

If johnhughtom/katt wants to die because her goal was to protect falco, then this is a poor reason to kill her, as it is a wasted effort. However, if, like pever stated, katt turns vengeful/maniacal after falco dies, then perhaps we should assist her.