A -25-year-old woman was hacked to death at her home in Guayaguayare on Wednesday during a domestic dispute.
The police identified the victim as Trishana Mohammed of La Brea Village.
The unemployed suspect, 40, a male relative, was taken into police custody shortly afterwards.
Mohammed was with her three children in the house when she was attacked. No one else was injured.
After the man killed her, he walked out into the road holding a cutlass, believed to be the weapon used to kill her.
He stopped a passing police car and told them what he had done.
Mayaro and Homicide Bureau Region II police are on the scene.