Two men are detained on suspicion of murder and three others are held over the death in Gateshead.
Andy Foster's family said he was a "kind and funny boy who was so loved"
Andy Foster, 26, was attacked at his home on Eighton Terrace, Gateshead, on Sunday and later died in hospital.They were detained along with a 34-year-old man, and two women - aged 37 and 30 - who were arrested on suspicion of assisting an offender. Detectives previously said two people had knocked on Mr Foster's front door, sprayed the substance at him and fled.
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