By Sandra · · UCF #104200218

Page last modified on Saturday, 24-Sep-2022 20:15:32 EDT

CLOSED Muriel Mann

Muriel Mann

Police in the Kennebecasis Valley say they have completed their investigation into a historical homicide from nearly four decades ago. The Kennebecasis Regional Police Force (KRPF) released an update Wednesday, March 30, 2022 on the homicide of Muriel Mann.

Saint John, New Brunswick - After 38 years, the gruesome murder of Rothesay nurse Muriel Mann has been solved with new information, clearing the name of Mann's former boyfriend 17 years after his own death, according to the Kennebecasis Regional Police Force.

On March 6, 1984, Mann's body was discovered in the freezer of her Hillhurst Drive home by two friends after they checked in her. At the time of the murder, Mann had been dating John Mavon, and according to his daughter Diane Heans, Mavon, who hadn't heard from Mann in a couple of days, was there at the home with a next-door neighbour when Mann's body was discovered.

Despite public appeals, the Mann murder case grew cold over time. But on March 17, 2022 - a little over 38 years to the day of the murder - Heans says she received a call from the Kennebecasis Regional Police Force and was told her father, who had died in 2005, was no longer considered a suspect in Mann's 1984 murder.

Family and friends have known Mavon was innocent for decades, Heans says, but now, hopefully other people will believe it too. While police never formally accused Mavon of being a suspect, Heans says a "cloud" has followed her family's name for nearly 40 years.

When approached by the Telegraph-Journal with this information, the Kennebecasis Regional Police Force confirmed in a press release Wednesday, March 30, 2022 that Mavon is not a suspect in the homicide and the Mann case has been closed.

"As a result of new information received anonymously from the public, the KRPF Criminal Investigation Division recently re-opened this cold case, and now have new and updated information,” police said in a news release.

Detectives identified new suspects and, in response to a media inquiry, confirmed that John Mavon is not one of them.

Police said they are “confident” that Mann had become aware of criminal activity by someone she knew and was murdered due to fear she might report it to police.

"Her children were never considered suspects and have been updated on these new findings," said police.

Because 38 years have passed and those involved have since died, police said they "will never be given the opportunity to validate our findings in court."

Citing respect for everyone concerned, police said they will not provide more information on the case.

"Our investigation is now complete, and the file is closed."


No recent updates. Any update on this case, please contact us at

Ready to do something?

Get notified when a new Unsolved Case is published

REWARDS Steven Michael Hall

Steven Michael Hall

The Government of the Province of Nova Scotia is offering rewards of up to $150,000 for information leading to the arrest and conviction of the person(s) responsible for the murder of Steven Michael Hall.

REWARDS Sadie Rogers

Sadie Mae Rogers

The Government of the Province of Nova Scotia is offering rewards of up to $150,000 for information leading to the arrest and conviction of the person(s) responsible for the murder of Sadie Mae Rogers.

REWARDS Jane Johnson And Cathryn

Jane Johnson And Cathryn

A reward of $50,000.00 is being offered for information leading to the arrest of person(s) responsible for the murder of Jane Johnson And Cathryn.

More Cases »


Byron Carr

Carr was last seen alive at approximately 3:00 am, Friday November 11, 1988, which was the beginning of a long Remembrance Day weekend. He was found dead in the bedroom of his home, 24 Lapthorn Avenue in Charlottetown, PE, 31 hours later. Evidence at the scene indicated his death followed a sexual encounter with another male. Carr was strangled, stabbed and the killer left a note saying; "I WILL KILL AGAIN!"....

MOST-READ Jean Virginia Sampare

Jean Virginia Sampare

18-year-old Sampare was described as a healthy, normal 18-year-old woman who sang teasing songs to her siblings. She was last seen by Alvin (her cousin) on Highway 16 outside Gitsegukla, British Columbia on October 14, 1971. He left her alone as he cycled home to get a jacket, and she was gone when he returned.