I've lost my own DC before so I'm familiar with taking the term 'grief' too literally here
But it does feel like a genuine, sad loss.
I'm not even finished the final series yet... there are 6 series and I'm on the final one 
I feel so sad I won't get to carry on escaping to this TV series every time I watch it. I'll miss it all so much
AIBU? Has anyone else felt similar over a series?