Havng mercy upon a Faasiq (open sinner)
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Question: When a Muslim dies, is it permissible to have/show mercy to him if he was a faasiq (open sinner) during his life?

Response: Yes, it is permissible to have/show mercy to him, and to supplicate for him to be pardoned and forgiven, as the funeral prayer should (also) be prayed upon him if he was a faasiq and not (if he was) a kaafir.

Shaykh Ibn Baaz
Majmoo' Fataawa wa Maqaalaat Mutanawwi'ah - Volume 6, Page 496