Chris Bryant MP, following this atrocious murder, wrote a good article in The Guardian today, mainly discussing the security, or lack of it around MPs, but also pointing out the toxic nature of social media, which everyone is well aware of , particularly those in public life. He said, and I completely agree, that those who issue such threats only do it under the cloak of anonymity. Oh to expose such cowards! who seem to get away with saying whatever without censorship, where's the accountability 
I feel very saddened by this MPs awful killing as I was when Jo Cox was taken in the same way.