Rushane Barnett, the 23-year-old man charged with killing his 31-year-old cousin, Kemisha Wright, and her four children, has pleaded guilty.
He pleaded guilty to five counts of murder when he appeared before Justice Leighton Pusey in the Home Circuit Court on Thursday.
Earlier, a psychiatric report had found that accused quintuple murderer was fit to enter a plea and stand trial.
A date for sentencing is to be finalised.
The killing of the family of five – Kemisha Wright and her four children Kimanda Smith, 15; Shara-Lee Smith, 10; Rafaella Smith, 5; and Kishaun Henry, a 23-month-old boy – had left the entire country outraged.
Residents discovered the victims with several stab wounds and their throats slashed at their home in New Road, Cocoa Piece in Clarendon on Tuesday, June 21.
It is alleged that Barnett and Wright were involved in frequent arguments.
Barnett had reportedly fled Trelawny after he was said to have been involved in lotto scamming.
He was also charged for unlawful wounding by the police in relation to the injuring of his father during previous altercations.
However, his father withdrew those charges.
In June, the Office of the Director of Public Prosecutions (ODPP) has indicated that it will be seeking the death penalty against Barnett.