Man decapitatet in Greyhound Bus - Death Penalty?

I just read the news about a shocking incident in Canada. A man killed another person during
a bus trip without any reason and after almost killing him, he "decaptiated" the man. Obviously no one was able to stop this crazy guy. You can read here: Protected content

well I am not a friend of death penalty , but after hearing this horrific story I would reconsider it for special cases. Especially I am shocked about the decapitation. Bad enough to kill someone else without reason, but this special action indicates, that the murderer has no respect for anything, even the dead person. Such people are a threat to society and should be eliminated - what do you think?