Ricardo Diaz's Ghost is an unproven myth in Gta: Vice City.
Sightings
His ghost is said to be felt by some user's on the internet. User's reported to have felt windy voices and strange whistles all over the mansion. It could probably be his ghost as he was murdered in his own mansion (now Vercetti Mansion).
His ghost is believed to roam around the mansion at late hours. He was of cunning nature so it is possible for the ghost to get hostile at times.
Vercetti state (where the ghost is reported to roam)
Possible poltergeist
The Ricardo ghost could also be a poltergeist. Similar to poltergeist activities, people have reported that his ghost is the one behind changing the portrait's from their initial position's. This fact is also discarded as many gamer's hold the opinion that the portraits were displaced by the Vercetti gang after their takeover.
False Mods
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Modified Ricardo Diaz Ghost
Users have also developed false mods regarding this myth. In these mods, the ghost of Ricardo Diaz roams around the mansion, bleeding. His ghost is visible to the user. These mods have further made the myth more complicated, as most users might make hoaxes, to prove it.