RTE's Crimeline programme, which last night featured the brutal murder of civil servant Marilyn Ryan on December 22nd last, received a "tremendous" response from the public last night.
But one call in particular, from a man who called himself "Brickie", brought a special appeal from the garda leading the investigation, Chief Supt Jim McHugh.
"He was a male caller who gave very useful information. He called himself `Brickie' and I would ask him to call us again tomorrow at Cabra station," said Chief Supt McHugh at the end of the programme.
Mr Stephen Rynn, brother of Ms Rynn, appealed on the programme for information about her last hours.
Ms Rynn's naked body was found on waste ground near her home in Blanchardstown, Dublin, on January 7th. Crimeline reconstructed her last known movements with the help of investigating gardai.
The programme showed a woman hailing a taxi outside the Sheiling Hotel in Raheny, where Ms Rynn had been attending an office party. The taxi was shown dropping her outside the Eddie Rockets diner in O'Connell Street. She was then depicted walking across O'Connell Bridge to the Nitelink bus stop in Westmoreland Street, alighting from the bus in Blandchardstown and taking the path, where gardai believe she was raped and murdered, as a short cut towards her home.