At this point, his "crime" is simply evading arrest. It will be interesting to see what they charge him with to justify a seven year siege.
...it's not the cat's fault, and the cat doesn't have to prove that it is a vicious killer one needs to hide from.
I think only Assange and Ecuador really had it in their power to alter the length of the "siege", I don't think the Met Police were going to simply say "whatevs" once he had skipped bail.