James Kennedy

Dr James Kennedy had a practice in Dillmouth, but after his retirement he relocated to Woodleigh Bolton.

(may contain spoilers - click on expand to read) He strangled Helen Halliday, his sister.

Miss Marple
He was played by Frederick Treves in the 1987 BBC TV film Sleeping Murder.

BBC Radio 4 adaptation
He was voiced by Julian Glover in the 2001 Radio 4 adaptation of Sleeping Murder.

Agatha Christie's Miss Marple
He was played by Phil Davis in the Agatha Christie's Miss Marple episode Sleeping Murder.