Lincolnshire Police say officers were called to Union Street in the town at 5.07pm where a man in his 30s had been found with suspected stab wounds.
A force spokesperson said that, sadly, the man later died.
“Our thoughts are with his family at this time, and they are being supported by specialist officers.”
A 55-year-old man was said to have nbeen arrested yesterday on suspicion of murder.
Police have now revealed a 29-year-old man and a 31-year-old woman have also been arrested on suspicion of murder.
All three remain in police custody.
They said: “Residents will see an increased police presence in the town as our investigation continues.”
Investigators remained no the scene, with a forensics tent. Floral tributes have also begun to be left near the police cordon from well wishers.
Officers are appealing for anyone who witnessed the incident, or who has any information that could help, to contact them on 101 quoting incident 370 of March 12.
1. Scene of a fatal stabbing on Union Street, Market Rasen
Investigators and a police cordon remain at the scene of a suspected fatal stabbing on Union Street, Market Rasen. Photo: David Dawson Photo: David Dawson
2. Scene of a fatal stabbing on Union Street, Market Rasen
Officers remain on the scene at Union Street, Market Rasen. Photo: David Dawson Photo: David Dawson
3. Scene of a fatal stabbing on Union Street, Market Rasen
Floral tributes have begun to be laid on Union Street, Market Rasen. Photo: David Dawson Photo: David Dawson