I am so sorry and sad to hear the news about Sogyal Rinpoche. In his lifetime his disciples served him in the very best way possible. Now it is time that we all need to pray for His rebirth for the benefit of all sentient beings. Especially pray for Rinpoche’s wishes to serve others and set them in the right direction to achieve Bodhichitta and emptiness. Therefore, all disciples please practice for Rinpoche’s teachings for Bodhichitta and emptiness - this is the best way to fulfil Rinpoche’s wishes and it is also the best way to achieve nirvana ourselves. It is not useful to become sad. I will also pray for His rebirth for the benefit of all sentient beings.