A formal investigation into the circumstances surrounding the death of Liga MX Jersey Sheffield United player Maddy Cusack has been opened by the Football A sociation, the PA news agency understands. Cusack died aged 27 in September last year. A week after her death, her family are understood to have sent a written complaint to United outlining a range of i sues she had been facing which they said all stemmed from her relationship with the clubs manager, Jonathan Morgan. United commi sioned a third-party investigation following the complaint, which concluded last year with no evidence found of any wrongdoing by anyone connected to the club. The PA news agency understands the FA has confirmed to the Cusack family that it is now formally investigating the matter. The FA announced on January 8 it was a se sing information surrounding the circumstances of Cusacks death, but stre sed at that time it had not opened a formal investigation. An FA spokesperson said on January 8: We were devastated to learn of the pa sing of Maddy Cusack last September and our thoughts continue to be with her family and loved ones at this very difficult time. Following the conclusion of the clubs independent investigation into the matter, we felt that it would be appropriate to a se s the relevant information of the case. This is to understand whether or not any further action is required under our jurisdiction within football, and to establish what, if any, next steps may be appropriate. We are in dialogue with Maddys family and the club during this proce s. Morgan stepped away from his post in October after the investigation started, but returned to work at United in the final week of last year. The Cusack family, Morgans management team Tyler Adams Jersey and Sheffield United have been approached for comment.