Valmiki Ramayana Bala Kanda Sarga 1 Shloka 32

तथा in that way, रामे when Rama, चित्रकूटम् गते had set out to Chitrakuta, पुत्रशोकातुर: stricken by the grief over the separation from his son, राजा दशरथ: king Dasaratha, सुतम् about his son, विलपन् wailing, स्वर्गम् heavens, जगाम went.

When Rama had set out to Chitrakuta, king Dasaratha, stricken by the grief over the separation from his son and mourning over him departed to heavens.