An investigation has started after a 39-year-old man died shortly after being taken into police custody.
Lloyd Butler, from Sheldon, Birmingham, was arrested following a call from his family that he was drunk and incapable.
He was put in a cell at 1215 BST on 4 August and kept under observation due to his poor condition, the Independent Police Complaints Commission said.
West Midlands Police checked on him at 1515 BST then started first aid. He was taken to hospital but declared dead.
Police referred the death at Stechford police station to the Independent Police Complaints Commission (IPCC) which began investigating on 5 August.
The IPCC said it had been asked to review the police officers' actions to ensure they had followed national and local guidelines for custody care.
Len Jackson, IPCC commissioner responsible for West Midlands Police, said: "The loss of a loved one is difficult for any family to respond to and this is especially the case when that person has been in the care of others.
"They will have questions about whether everything possible was done to help their loved one.
"Our investigators will address exactly those questions; by interviewing the officers concerned and by reviewing the custody CCTV and action logs to ascertain whether appropriate care was given to Mr Butler."