A POLICE investigation into a horrific murder will be documented in a television show airing tonight.

Thames Valley Police were filmed for Channel 4's Catching a Killer series.

An episode airing at 9pm will document how the force caught Ben Field, a churchwarden who murdered an author in a bid to inherit his £36 million estate.

Benjamin Field, 28, duped 69-year-old Peter Farquhar into a fake relationship .

Mr Farquhar died in Maids Moreton, Buckinghamshire, in October 2015 and Field tried to make his death look like an accident or suicide.

The Baptist minister's son was found guilty of murder at Oxford Crown Court in August.

He was also accused of plotting to kill Mr Farquhar's neighbour Ann Moore-Martin, 83, but was found not guilty.

Field admitted duping both Mr Farquhar and Miss Moore-Martin into fake relationships with him.

He was sentenced to life imprisonment, to serve a minimum of 36 years.

Officers DS Natalie Golding and DC Jenny Chapman will be taking part in a Q&A on Twitter during the broadcast, using the hashtag #CatchingAKiller.