Post-mortems are due to be carried out on Tuesday for the murdered man and woman whose bodies were found in a bungalow in Branston on Monday.
Forensic teams searched the house in Branston after the two bodies were found by police at the house on Lincoln Road. It was reported to police shortly after 11am on August 5.
The entrance to the property remains cordoned off and police vehicles were still guarding the scene on Tuesday morning. Detectives have also carried out door-to-door enquiries.
A 22-year-old man, who was arrested on suspicion of murder on Monday afternoon, remains in police custody.
Detectives have not named him or charged him at the time of writing.
Police have not named the victims either and are in the process of contacting next of kin.
Formal identification of the victims has also not yet taken place.
A spokesperson for Lincolnshire Police said: “This is believed to be an isolated incident, and we continue to investigate to establish the circumstances.”
People in the quiet village said they were shocked to hear about a double murder.
Anyone with information, or who may have seen anything suspicious, should call police on 101 quoting Incident 135 of August 5.