An area remains sealed off following the discovery of a body of a woman in her 50s near Ballyconnell.
Gardaí have launched a murder investigation.
Gardaí said they were alerted to a serious incident in at a rural home on a cul de sac in Kilnavart near Ballyconnell at approximately 9.30pm last night. The woman's body was discovered by gardaí at the scene and a man in his 60s was seriously injured and was brought to Cavan General Hospital where he remains in a serious but stable condition.
One man aged in his 30s was arrested at a separate location, and detained pursuant to Section 4 of the Criminal Justice Act 1984, at a Garda Station in the Co. Cavan area.
Investigating Gardaí are appealing for witnesses and those with information to come forward.
Reporter Ronan Gargan has been speaking to local councillor Áine Smith on the scene, who says she is thinking of the family at this very difficult time:
Meanwhile, local Deputy Brendan Smith says the community is in shock:
