Dublin Murders is tipped for a second season after it was "well received" by viewers, with an average of 206,300 watching the finale live on Wednesday.
The series, starring Sarah Greene and Killian Scott, saw 24pc of the national audience share tuning in to see how the murder mystery thriller would end.
The programme has been streamed more than 400,000 times on the RTE Player, latest figures show.
An average of 299,200 viewers watched the first three episodes within seven days of them being aired. The two-hour episodes attracted a 28pc audience share.
"It did very well for RTE, with the Player figures alone excellent, so a second series could very well be on the cards," a source told the Herald.
The series foll-owed detectives Cassie Maddox, played by Greene, and Rob Reilly, played by Scott, as they investigatde who killed Katy Devlin and the mysterious case of Lexie Madison.
Based on Tana French's acclaimed Dublin Murder Squad novels, the series was set in Celtic Tiger Dublin in 2006.
Viewers for all episodes up to the finale had increased by an average of 100,000 when the numbers who watched after recording it, within seven days of airing, were taken into account.
Scott previously said he had to master his character's English accent and used it on set while surrounded by an Irish cast and crew filming in Belfast and Dublin.
"I just felt myself cringing occasionally when I would ask one of the assistant directors for an Americano in this English accent," he said.
"Sarah had to do a Dublin accent, so we were both competing.
"I had a wonderful, incredible dialect coach, Brendan Gunn, from Belfast, who has worked with Brad Pitt and Daniel Day-Lewis, and me."
Cork actress Greene said: "I love working in Ireland, I'd take every job that they give me here because I love coming home. The crews in Ireland are just the best in the world."
The series was adapted from the books by top screenwriter Sarah Phelps.