Palakkad: A man was taken into custody following the murder of an elderly couple at Pulackalparambil near Tholanur here on Wednesday.
Sudharshan, a friend of murdered couple's daughter-in-law, was picked up by the police near Palakkad KSRTC bus stand.
While Swaminathan (72) was found stabbed to death, his wife Premakumari (65) had been suffocated using a pillow.
Their daughter-in-law was found with hands and legs bound, police said.
The twin murders came to light this morning by a woman who came to deliver milk, police said.
The couple had, a week ago, filed a complaint with the police that they were receiving death threats. A police team, including Malappuram SP Debesh Kumar, arrived at the crime scene.
(With inputs from PTI)