A man died as West Yorkshire Police officers made an arrest at a house in Leeds.
Nazim Din, 54, collapsed at his home at Grasmere Court, Wortley, at 19:00 BST on Wednesday as a 34-year-old man from the same address was arrested.
He was taken to hospital but later died.
West Yorkshire Police said it was "cooperating fully" with an Independent Police Complaints Commission (IPCC) investigation.
A family statement said: "As a family we are devastated by the death of Nazim Din.
"He was a family man, a loving husband and a doting father of five children who he leaves behind."
The arrested man also suffered a "medical episode" but is now in custody, police said. The force said his arrest, on suspicion of criminal damage, was "pre-planned".
Anyone who witnessed the incident is asked to contact the IPCC.