Two investigations are underway into the suicide of a gay former police officer after allegations emerged he was bullied over his sexuality while serving in the force.

Notes kept by Michael Maynes detailing disturbing allegations of bullying at a suburban police station in Melbourne's east surfaced when the 30-year-old took his own life late last year.

Michael Maynes, who took his own life last year.

The discovery sparked an internal bullying investigation by Victoria Police's professional standards command and will be assessed in a coronial investigation probing the circumstances that led to his death.

It raises further concerns about a culture of bullying within Victoria Police after the Police Association said late last year the union had received more than 200 bullying complaints over last two years.