There are two sentences:
Police believe my neighbor robbed a bank.He is a/an ..........
She stole the money.She was......... of the crime.
I think for firat sentence we should use "guilty" and for second one "suspect". Because suspect of the crime make more sense than guilty of the crime.but I am not sure. On the other hand I think we use suspect when we are not sure who is the criminal.In the first sentence if the word 'believe' means polices are not completely sure the answer to first one should be suspect and second one guilty.