Three students and a 35-year-old Clarendon man were on Wednesday night shot dead in the Monymusk Housing Scheme, Hayes in the parish.
The police have identified them as: 14-year-old Raymond Givens, a student of the Bustamante High School; Ricardo Brisco, also 14 years old, of Garvey Maceo; and 15-year-old Alex Turner of Central High.
Turner was pronounced on arrival at May Pen Hospital.
The fourth victim is Mariqus Hamilton, a 35-year-old accounts clerk at the Sugar Company of Jamaica.
Police investigators say it appears that the four were shot execution style as they were found face down with bullet wounds to the head.