In 1996 Keith Doolin was sentenced to death for the murder of two women in Fresno, California, as 20 Years on Death Row reports.

For 22 years Keith, alongside his family and friends, has protested his innocence.

Due to a change in the law there is a real urgency about his case as inmates are now only held on Death Row for so long.

As this four-part series begins, Keith’s mother, Donna, hires a private detective to help clear her son’s name.