The great-grandson of Victorian Poet Laureate Alfred Lord Tennyson has been found stabbed to death in his flat.
Police were called to the home of Hallam Tennyson in Crouch End, north London on Wednesday, where they found the 85-year-old collapsed in his bed.
Results of a post-mortem examination revealed the cause of death was stab wounds to the neck.
Mr Tennyson, who was gay, was found by a former partner who lived in the same house.
Detectives say they want to find out about retired BBC executive Mr Tennyson's last movements. They are expected to interview his former boyfriends.
Detective Chief Inspector Tony Nash said: "This was a brutal attack on an elderly and vulnerable man.
"Despite his years Mr Tennyson was a lively individual who continued to lead a full and active life.
"It is now vital that we build up a picture of Mr Tennyson's last movements and we are appealing to anyone who may have seen him on the days leading up to his murder to contact us."
Detective have said they are keeping an open mind over the killer's motive.
He is not thought to have been the victim of a robber as nothing was stolen from his flat.
Mr Tennyson, who was married for 20 years and had two children, wrote a biography, A Haunted Mind, in 1984.