MILWAUKEE (CBS 58) -- The Milwaukee County Sheriff's Office says a man died in police custody Tuesday morning, Aug. 18. 

Officials say the 45-year-old man died shortly after being transported from the West Allis Police Department to the Milwaukee County Jail. 

The Milwaukee County Medical Examiner's Office identified the man as 45-year-old Kourtney Edwards. 

The man was initially cleared by nursing staff during the booking process, according to the sheriff's office, however shortly before 8:30 a.m., he told jail staff he had vomited and wasn't feeling well.

Nurses determined he should be taken to a hospital for further evaluation, and as an ambulance and deputy escort prepared to take him, the sheriff's office says the man "experienced a medical emergency," going pulseless and not breathing. They say first responders attempted lifesaving measures, but the man was pronounced dead at 9:30 a.m.

Deputies initially picked up the man from the West Allis Police Department at 4:25 a.m. Tuesday on MCSO warrants, according to the sheriff's office, and the process of booking him began on charges of operating while revoked, operating while intoxicated 2nd, operating with a prohibited alcohol content, and ignition interlock device tampering. 

The Waukesha County Sheriff's Office is investigating the man's death.