Police found the former TOWIE star and ex-Boston United footballer with fatal head wounds at a rented villa in Santa Margalida, where he was staying with six others.
The Foreign Office said it is supporting the family of the British man, while the Spanish Civil Guard questions the group and investigates; no arrests have been made.
Hall appeared in three series of the ITV2 reality show from 2015, later ran a clothing brand and made art, and drew tributes from figures including DJ Fat Tony and Antony Costa.
What truly happened inside the Spanish villa before the former reality star's fatal accident?
Six witnesses are being questioned; what aren't they telling police about the star's death?