How to use "supposedly" in a sentence

So if they can't open the grave and see for themselves what we've done to Danny Evans, what are they going to do instead? They're going to do the next best thing - talk to the person who was supposedly the last one to see the boy's corpse before it was sealed in the coffin

"So they'll go to see the mortician who supposedly prepared the boy's body for burial."

Unable to prove his identity, he was required to pay for both nights in advance, which he did, taking the money from a wad of cash he'd stuck in his pocket rather than from the wallet that supposedly had been stolen.

A ghost supposedly guides your hand to deliver a message from beyond