CSI Great Grey Shrike

Well what a story ,I met with Sue at Southowram on sat morning to collect the Shrike and unbeknown to me a headless Blue Tit.The Shrike and Blue Tit were found on her door step just like the bottom pic.The Shrikes bill is full of bits of Blue Tit,the head was not found unless its in the Shrike,Sue said her cat had been in all night as sometimes cats bring in there kills.I can only think that the shrike must have been fighting with the Blue tit and flew into the door and killed itself.??I think the Shrike is an adult male.??Many thanks to Sue Holden for all her efforts to find out about the Shrike...