A 24-year-old Sea Lots man wanted for questioning in the disappearance and death of WPC Nyasha Joseph surrendered to police last night.
An attorney representing the boat owner contacted officers who took the man to the Four Roads Police Station.
Photographs of the suspect, who some know by the nickname "Dole" began circulating on social media on Wednesday, before Joseph's body was recovered by fishermen in the Gulf of Paria.
The man's home was searched by officers on Tuesday.
Police said he was a close friend of the 39-year-old man who was detained on Friday.
The decomposing body of the mother of one became tangled in a fishing net at the mouth of the Caroni River on Wednesday.
Police said two concrete bricks were tied to the woman's hands. The body was stuffed in a plastic bag. There were wounds to her neck and face.
The T&T Coast Guard took the body to the Tobago Ferry Terminal and then removed to the Forensic Science Centre in St James.
An autopsy would be performed this morning to determine how she died.
Joseph, 22, did not return to her Morvant home after leaving for work last week Thursday. She joined the police service last November.
A missing person report was filed on Friday.
A candlelight vigil was held in Joseph's memory at the Church of Epiphany in Morvant last night.