Ontario Provincial Police continue to actively investigate the 2013 murder of a nurse from Estaire, south of Sudbury. 

Seven years ago, on Oct. 7, 2013, Sheri-Lynn McEwan was stabbed to death in her home after returning home from a trip to Las Vegas with friends.

Officers responded to a 911 call and found the 40-year-old woman suffering from critical injuries.

Over the years, police have conducted hundreds of interviews, but have not identified the killer.

Three weeks after McEwan's murder, her husband, Terry Boyle, died by suicide. Detectives have ruled him out as a suspect.

"He was about 40 km away from the residence when this occurred. He was making a delivery for his job, and his cell phone indicated that he was also in that area," said Det. Insp. Jim Gorry.

Police believe McEwan was targeted saying a break-in was staged at the garage and there were signs of forced entry with the door to the house kicked down.

A $50,000 reward has been offered by the Government of Ontario for information leading to the arrest and conviction of the person(s) responsible for McEwan's death.

Anyone with any information about the incident or who may have seen suspicious activity is asked to call police at 1-88-310-1122, the tip line at 1-866-220-2505, or anonymously through Crime Stoppers 1-800-222-8477.

With files from Alana Everson, CTV News Sudbury