Assistant Public Prosecutor Ayub Khan allegedly attempted to influence the case by seeking bribe from some of the accused, sources in the Crime Branch police said.
The sources said police have "secured strong evidences" to establish the charge against him.
However, when approached by some local TV channels, Khan denied any kind of malpractice by him.
State Public Prosecutor Mohan C Menon is learnt to have been approached by Crime Branch officials seeking his removal from his responsibilities.
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Five persons, including her parents were convicted by an Additional Sessions court last year.
The case came to light in 2011 after the girl from Paravoor complained to her aunt about her plight after which a police complaint was lodged.
In her complaint, the girl had said her father, who used to do small roles in Malayalam films, was the first to rape her.
The victim was taken to various places and raped after being promised roles in films.