It focuses on a woman who decides to marry a death row prisoner when her visa to live in the USA is denied
Morgan says: "Only one woman is prepared to marry a maniac to get there. And that woman is me"
BBC Two is to pilot a sitcom starring Diane Morgan as a woman who decides to marry a prisoner on death row so she can get a visa to live in America.
Lethal will be broadcast in 2021 as part of the channel's New On Two strand.
Written by Morgan and Pippa Brown, Lethal will star Morgan as Becky, a woman from Bolton obsessed with America and who has always wanted to live there. But when her visa application is denied she has to come up with a Plan B. Her Plan B is simple, marry a prisoner on death row, get her Green Card and live the 'American Dream'.
Diane Morgan says: "Some people will walk through the parched desert to get into America, some will cross a vast ocean, only one woman is prepared to marry a maniac to get there. And that woman is me. Well, a woman I play. But I probably would too."
BBC commissioner Shane Allen says: "Lethal is a cleverly conceived comic tour de force in which an ill-conceived plan soon spirals and unravels disastrously. In Becky, Diane gets to flex her well-honed comedy muscles with another sublime creation."