An investigation has been launched after a woman was found dead at a house in Garston.
Police and paramedics were called to a property in Clarke Way at 5.08pm Monday, December 16.
Emergency services declared the woman dead at the scene.
Hertfordshire Constabulary have a police cordon in place and confirm a teenager has been arrested while investigations continue.
Detective Inspector Iain MacPherson, from the BCH Major Crime Unit, said: “An investigation has been launched to establish the circumstances of the death and forensic officers remain at the location as part of this.
“A 17-year-old male has been arrested and is currently in police custody while the investigation continues.
“We would like to reassure the public locally that at this stage it is believed to be an isolated incident.”