<p>Someone injected three residents with lethal doses of insulin at an aged care facility in Newcastle. Now, the race is on to catch the killer. Will the police find the clues they need to catch the culprit before any more deaths occur?</p>

Someone injected three residents with lethal doses of insulin at an aged care facility in Newcastle. Now, the race is on to catch the killer. Will the police find the clues they need to catch the culprit before any more deaths occur?

02 The Invisible Killer | 'Who did this?'

Background Briefing is the ABC's flagship investigative journalism podcast. Its award-winning investigations and documentaries expose cover-ups, corruption, real-life mysteries, whistleblowing, crime, fraud and miscarriages of justice — often before these stories receive mainstream attention.

The Background Briefing podcast brings you true stories not everyone will want you to hear, told by trusted reporters across Australia.

This Australian podcast makes investigative journalism bingeable. From scams and fraud to schooling and health scandals, tech and social media digs, police exposes and various unsolved cases, each episode of the Background Briefing podcast is a must-listen.

Recent series include:

Hometown Boys exposed how a terrible crime fractured a local community around a local football club.

The Invisible Killer: a forensic investigation into unexplained deaths in aged care after a doctor makes an unusual discovery.

The Favourite: how a schoolyard secret stayed hidden for years.

Stop and Search, which uncovered the mechanics of power and police accountability.

Before and After investigated medical hype, telehealth, body image, cosmetic procedures and consumer risk.

Beef: how small feuds escalate into serious disputes.

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Background Briefing is the ABC's flagship investigative journalism podcast. Its award-winning investigations and documentaries expose cover-ups, corruption, real-life mysteries, whistleblowing, crime, fraud and miscarriages of justice — often before these stories receive mainstream attention. The Background Briefing podcast brings you true stories not everyone will want you to hear, told by trusted reporters across Australia. This Australian podcast makes investigative journalism bingeable. From scams and fraud to schooling and health scandals, tech and social media digs, police exposes and various unsolved cases, each episode of the Background Briefing podcast is a must-listen. Recent series include: Hometown Boys exposed how a terrible crime fractured a local community around a local football club. The Invisible Killer: a forensic investigation into unexplained deaths in aged care after a doctor makes an unusual discovery. The Favourite: how a schoolyard secret stayed hidden for years. Stop and Search, which uncovered the mechanics of power and police accountability. Before and After investigated medical hype, telehealth, body image, cosmetic procedures and consumer risk. Beef: how small feuds escalate into serious disputes.

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02 The Invisible Killer | 'Who did this?'

02 The Invisible Killer | 'Who did this?'

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