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Angelo Colasanto was an Italian man who immigrated to America in 1927. When going through customs at Ellis Island he tried to steal Jack Harkness' visa, and was subsequently arrested. Jack visited Angelo in his cell, and used his Time Agency wrist strap to change the name on his visa to Angelo's, preventing him from being deported. Upon reaching New York City itself, Jack and Angelo then rented a room together, where they began a physical relationship.
The two began to distribute "sacramental wine", during a period of prohibition, but were kidnapped almost immediately by the local mob. After suggesting that they work for the mob, they were given the job of moving a crate from one warehouse to another. Despite being told to flee, Angelo persuaded Jack to let him stay, and the two set about their task. When they arrived at the warehouse, Jack admitted that he was on a mission from Torchwood, and opened the crate to reveal a brain parasite that the Trickster's Brigade were planning to use on Roosevelt. When the parasite tried to attack Angelo, Jack killed it and dissolved its corpse, completing the mission, but was shot in the head when trying to escape, while Angelo was arrested.
Upon his release from prison a year later, Angelo was surprised to find that Jack was alive and waiting for him. Despite rejoining him, Angelo assumed that Jack must be the devil, and stabbed him. He was shocked when Jack came back to life again, and showed this to some people at a butcher's shop where a crowd of people soon gathered. The crowd repeatedly killed him to witness the resurrection, some possibly gathering vials of his blood. When the crowd left, Angelo freed Jack and planned to go with him. However, Jack no longer trusted Angelo, and jumped off of a building in a symbolic gesture and to prevent Angelo from following him.
Angelo was apparently still alive in 2011, and was somehow involved in the miracle. (TW: Immortal Sins)