Murphy had brought a good stop from Noel Mooney in the first half, but made no mistake from the penalty spot on the hour after Keith O’Halloran had handled a cross from Gareth McGlynn.

The only sour note for Derry was the 85th minute sending-off of Eamon Doherty for a second booking.

Rovers then almost snatched a point late on, but Trevor Molloy hit a post and Shane Robinson missed a sitter.

Eircom League First Division:

Limerick 0 UCD 3

Kildare County 2 Athlone Town 1

Sligo Rovers 4 Monaghan United 0.