Halakhah zu Tehillim 16:1

If an orphan is present in the cemetery, then, after the burial, (if it is still day) the people should step away a distance of at least four amos from the graves and recite the psalm, "Lamenatzaich" ("To the chief musician") etc. "Shimu Zos" ("Hear this") etc.⁶Psalms 49. On a day when Tachanun is not said, "Michtam Le'Dovid" etc. is said.⁷Psalms 16. The orphan then says the Kaddish: "D'Hu Assid Lehischadetah" ("That he will renew"), and those present recite with him up to "Vikarei" (And may this happen). In some communities it is customary that the Kaddish is recited first before the burial, following Tzidduk Haddin. There are communities where even Tzidduk Haddin is not said until after the burial.