In 2003, Nesbitt played undercover police detective Tommy Murphy in the first series of ''
Murphy's Law, after starring in a successful pilot episode in 2001. The series was conceived when Nesbitt was working on Playing the Field''; he and producer Greg Brenman approached author
Colin Bateman about creating a television series for Nesbitt in a similar vein to Bateman's Dan Starkey novels. Bateman and Nesbitt were already well acquainted; Nesbitt had been considered for a main role in
Divorcing Jack (
David Caffrey, 1998), based on Bateman's original novel. A 90-minute pilot of ''Murphy's Law'' was commissioned by the BBC, initially as a "comedy action adventure". In 2003, Nesbitt won the
Irish Film & Television Award (IFTA) for Best Actor in a TV Drama for the role. The second series was broadcast in 2004. By 2005, Nesbitt had become tired of the formula and threatened to quit unless the structure of the series was changed. He was made a creative consultant and suggested that Murphy keep one undercover role for a full series, instead of changing into a new guise every episode. With his trainer, he worked out three times a week, boxing and doing circuits and weights. After the first new episode was broadcast, Sarah Vine wrote in
The Times, "In the past, when attempting a nasty stare or a hard face, Nesbitt has never managed much more than a faintly quizzical look, hilarity forever threatening to break out behind those twinkly Irish eyes. But here, it's different. He genuinely has the air of a man who means business." The refreshed series marked another milestone in Nesbitt's career; he describes it as "a big moment" in his life. In 2004, Nesbitt appeared in
Wall of Silence, a fact-based drama about the aftermath of the murder of schoolboy Jamie Robe. Nesbitt played Stuart Robe, the boy's father, who tries to break down the wall of silence in the local community to discover exactly what happened to his son. He had only just completed
Bloody Sunday when he was offered the part and was unsure whether he wanted to take on such a demanding role so soon after playing Ivan Cooper. He decided to accept the part because he found it interesting. To prepare for the role, Nesbitt met with Robe and spent weeks talking to him in his South London flat, learning about Jamie, and of Robe's fight for his justice. Nesbitt spoke with his natural accent instead of affecting Robe's South London speech, as he did not want the audience to be distracted from the drama. The single-drama was filmed over four weeks and broadcast in January 2004. The role gained Nesbitt an IFTA nomination for Best Actor in a TV Drama later that year. In March 2004, he appeared in
Tony Marchant's
Passer By, playing Joe Keyes, a man who witnesses a woman being accosted by some men on a train and chooses not to help. Keyes later discovers that the woman was raped but cannot bring himself to admit in court that he did nothing to help her. Nesbitt described Keyes as "like a better man than me: a good father and husband. But, once he has made a wrong decision, he can't control everything in his life, as he thinks he is weak. He loses the respect of his wife, his son and at work, and has to reach the lowest possible point before finding redemption." As a result of these serious roles, he was named the
sixth most powerful figure in TV drama in a listing compiled by industry experts for the
Radio Times. In September 2004, he starred as Jack Parlabane in the ITV adaptation of
Christopher Brookmyre's
Quite Ugly One Morning. The producers originally wanted Scottish actor
Douglas Henshall to play
Glaswegian Parlabane but ITV executives overruled them and cast Nesbitt. He was given coaching to perfect the accent but it was soon discarded on the advice of both the director and his co-star
Daniela Nardini. Also in 2004, he filmed the roles of Ronnie Cunningham in
Millions (
Danny Boyle, 2004), and Detective Banner in
Match Point (
Woody Allen, 2005). He was considering taking time off from acting and did not really want the role in
Match Point. He sent in an audition tape and was accepted for the part. Nesbitt's character appears at the end of the film and he read only that part of the script, so did not know the full circumstances of the crime Banner investigates. Nesbitt returned to theatre acting in June 2005 when he appeared in
David Nicholls'
After Sun, a ten-minute-play performed as part of the
Old Vic's 24-Hour Play season. Nesbitt and
Catherine Tate starred as a married couple who meet a pair of newlyweds returning from their honeymoon. Later that year, he appeared in his first full-length play in 11 years, in
Owen McCafferty's
Shoot the Crow. He enjoyed the stimulation of learning his lines and rehearsing with the cast and director. In
The Daily Telegraph,
Charles Spencer described Nesbitt's acting as "outstanding". ==
Jekyll,
Five Minutes,
Occupation==