If you planned to murder someone (which I know most of you wouldn't) how would you fool Columbo?

I'd just say I was at home under lockdown, and have no explanations for the other stuff

My plan would be to say nothing then get Perry Mason and Petrocelli to defend me

Got it.
Be working class, Columbo only ever arrests rich people.

Had a friend in London, her plan was to murder two random people, then kill her target, murder two further people, then just stop
Police would just think serial killer and not think about her links to the actual person

We split up not long after