धर्मात्मा the righteous one, राघवः descendant of the Raghu's (Dasaratha), तस्य महर्षेः that maharsi's, अप्रतिरूपम् unique, वधम् killing, विलपन्नेव while lamenting, पुनः again, कौशल्याम् to Kausalya, अब्रवीत् said.

Grieving for having unfairly killed the great sage the rightenous descendant of the Raghus (Dasaratha) coutinued to tell Kausalya about it: Dasaratha relates to Kausalya the event of the noble ascetic's curse on him -- death of Dasaratha