Episode four introduces Jim Howick as Aaron Mayford, who joins a growing list of suspects which also includes Leo Humphries (Chris Mason), Trish’s boss Ed Burnett (Lenny Henry) and her ex-husband Ian (Charlie Higson).
Early reviews have called Aaron “almost comically unpleasant” and “deviously creepy” – a far cry from the comedy roles that Howick is usually associated with.
The 37-year old is best-known for playing Mark’s love rival Gerrard in Peep Show, and for starring in CBBC’s Horrible Histories – which became a cult favourite among adults.
In 2010 Howick won a children’s BAFTA for his work on the show, in which he plays historical figures including George IV and Richard III.
Howick, who was born in Chichester, won his first TV role in The Armstrong and Miller show in 1997.
In 2004 he played Corporal Matlin in Guillermo del Toro’s Hellboy and in 2008 he joined the cast of The Kevin Bishop Show – one of many comedy sketch shows that he would go on to star in.
Along with his Horrible Histories cast mates, Howick created and starred in Yonderland – a family fantasy series that aired on Sky One from 2014 until 2016.
The cast reunited in 2015 for Bill, a family film about William Shakespeare during his ‘lost years’.
Howick followed the film with comedy series Stag and The Aliens.
After Broadchurch his next role will be in Loaded, a new Channel 4 comedy-drama about four life-long friends who become multi-millionaires overnight.
In 2012 Howick reportedly married his partner Lauren Denny, who he met through his Reggie Perrin co-star Kerry Howard.