Helric Fredou was the second-in-command of the Limoges SRPJ (regional branch of the judicial police) . I can't find his nomination but here is a 2014 administrative decision that cites him in this role.
The national police superintendent's union published a short note which only mentions Helric Fredou's death, without stating any cause.
Highlighting relevant passages from an article published by regional television France 3 quoted by Oddthinking:
un commissaire du SRPJ de Limoges s'est donné la mort la nuit dernière dans son bureau avec son arme de service. Une information confirmée par sa hiérarchie. On ignore à cette heure les raisons de son geste.
My translation: “A superintendent of the Limoges SRPJ killed himself last night in his office with his service weapon. This information was confirmed by the police hierarchy. The reasons for his gesture is not presently known.”
Le commissaire Fredou, comme tous les agents du SRPJ travaillait hier soir sur l'affaire de la tuerie au siège de Charlie Hebdo. Il avait notamment enquêté auprès de la famille de l'une des victimes.
“Superintendent Fredou was working on the Charlie Hebdo killings affair, like all of the agents of the SRPJ. In particular, he had participated in an inquiry with the family of one of the victims.”
This is a policeman in charge of the Charlie Hebdo investigation, not “the”. He did not have any leading role in the investigation, he was just one of many policemen investigating. He had a history of depression.
Selon le syndicat de la police le commissaire était dépressif et en situation de burn out.
“According to the police union, the superintendent was depressive and feeling burnt out.”
En novembre 2013, le commissaire Fredou avait découvert le corps sans vie de son collègue, numéro 3 du SRPJ de Limoges qui s'était également suicidé avec son arme de service dans son bureau. Il avait lui aussi 44 ans.
“In November 2013, superintendent Fredou had discovered the lifeless body of a colleague, third in the Limoges SRPJ hierarchy, who had also committed suicide with his service weapon in his office. He was 44 years old as well.”
I can't find the declaration from the union mentioned by the news article.
A November 2014 message from said union highlights suicide of police superintendent as a concern.
I can't find any article with more recent information. This is to be expected if this is genuinely a suicide for which the Charlie Hebdo was at most a triggering factor, not the primary cause.
In conclusion:
- The claim that a police superintendent by this name committed suicide on the given date is true.
- The claim that he was involved in the Charlie Hebdo investigation is true.
- The claim that he was in charge of the investigation is false.
- The claim of correlation between the Charlie Hebdo killings and Mr Fredou's suicide is correct. The implied claim of causation is undecided. The implied claim of primary causation is false.