[AngelicaDeAlquezar]

I agree with Perikles and Rusty.

"Las donas" are the subject and the indirect object is the murderer.

@Paco: The structure of the verb "gustar" needs the subject to be changed, but it is not the use of "voz pasiva refleja".

Voz pasiva refleja:
· Se ve que al asesino le gustan las donas. (It's plain to see that the murderer likes donuts.)
· Se cree que al asesino le gustan las donas. (The murderer is believed to like donuts.)


Voz pasiva (but these sentences would hardly be used by any native speaker... they sound awkward):
· Las donas son comidas por el asesino. (Donuts are eaten by the murderer.)
· Las donas son gustadas por el asesino. (Donuts are liked by the murderer.)


"Gustar de" is a variation on the use of the verb, and although it's not awkward, it's very rarely used:
(Examples are given only to show a use of the usual structure of subject + verb + complement in a sentence.)
· El asesino gusta de las donas. (The murderer likes donuts.)
· El asesino debe gustar de las donas. (The murderer must like donuts.)