Thus far, not a single suspect has been caught.

The police last night were searching for a single suspect, Sergeant Clifford said.

In a murder case, we need to speak to every single suspect.

They had not brought in a single suspect.

Set in the 1980s, a trio of murders are linked to a single suspect.

All evidence points to a single suspect who has fled the keep.

Why didn't we have a single good suspect?

We still didn't have a single good suspect.

The lawsuit focused on a five-year period in which the police killed 15 black crime suspects but not a single white suspect.

It is not known, for example, whether the inquiry has focused on any single suspect.