Death

I am a muslim and am incredibly upset at the passing of a certain non muslim he was a good guy and i wanted to ask if there is any dawah you can say for him? 

Bi ismillahi rahmani raheem

assalamu alaikum

The dua that rasul allah [sallah llahu alaihi wa sallam] said we should say is "Ina Lillah wa in illayhi raji'oun" From Allah we come and to him is our return.

مَا كَانَ لِلنَّبِيِّ وَالَّذِينَ آمَنُوا أَنْ يَسْتَغْفِرُوا لِلْمُشْرِكِينَ وَلَوْ كَانُوا أُوْلِي قُرْبَى مِنْ بَعْدِ مَا تَبَيَّنَ لَهُمْ أَنَّهُمْ أَصْحَابُ الْجَحِيمِ

which means: “It is not for the Prophet and those who have believed to ask forgiveness for the polytheists, even if they were relatives, after it has become clear to them that they are companions of Hellfire.” [At-Tawbah: 113] Imaam Ibn Taymiyyah, may Allaah have mercy upon him, said: “Seeking forgiveness for the disbelievers is forbidden in the Qur’aan, the Sunnah and by the consensus of the Muslim scholars”