Bertha and Barty

[Ersatz Harry]

No: HPFGUIDX 58732

In rereading part of GoF last night, I noticed that Voldemore says
Bertha Jorkins told him about a DE who would be willing to serve him
if only Voldemort could get to him (or something like that).  But why
would Bertha have known this?  Might there have been some relationship
between Bertha and the elder Barty Crouch that has not yet been
revealed?  Remember, Mrs. Crouch was already dead, so perhaps Bertha
provided him some, er, companionship.  If so, what else might Bertha
have known that she could have told Voldemort?

Ersatz Harry