Twenty years after musician Kurt Cobain was found dead in his Seattle home, police have come across four rolls of undeveloped film which they say more clearly show the scene of the death than previous Polaroid photos taken by investigators.

The pictures reportedly have a slight green tint to them due to deterioration but are in good enough condition to prompt Seattle police to reexamine the evidence processed in the case.

The 35 mm film was found last month inside an evidence unit alongside syringes Cobain had used as well as a drug kit. Police spokeswoman Renee Witt said officers plan to release the never-before-seen photos on the anniversary of Cobain’s death next month.

kurt cobain

Cobain with wife Courtney Love and daughter Frances Bean in 1993

The Nirvana frontman was found on April 8, 1994 by an electrician who had come to the 27-year-old’s home to do some work. Seattle’s chief medical examiner ruled that Cobain had killed himself three days earlier, shortly after the rocker had left a rehab facility for heroin addiction.

Along with the self-inflicted gun-shot wound, an autopsy also revealed a lethal amount of heroin in the singer’s bloodstream.

Though the discovery of the photos won’t launch an official reinvestigation, police will review all evidence from the case.