Question K

[Jonetta]

Did you ever suspect Black Jack of murdering either Estelle or Freddie? Why or why not?

[Robin]

I did not think Black Jack murdered Estelle. He just seemed too upset about her murder. As far as Freddie, if Black Jack didn't murder Estelle, I couldn't think of any reason he would want Freddie dead too. Therefore, I didn't seriously think that he had killed Freddie or had him killed.

[Jonetta]

I never, for a second, thought Black Jack had murdered Estelle as I couldn’t imagine a motive. Murdering Freddie never made sense so only Willy headed that list.

[~ Giulia ~]

Like you, I never thought Black Jack had murdered Estelle.
As for killing Freddie, the only motive I could think is if he thought that Freddie had been somewhat involved in Estelle's disappearance. But I never really seriously thought it was him, other minor characters like the bouncer were much higher than Black Jack on my suspect list.